The Dallas-Fort Worth Metroplex (also known as DFW or The Metroplex) is a large area in the Prairies and Lakes region of Texas. According to the 2010 census, the population of the Dallas–Fort Worth–Arlington, TX Metropolitan Statistical Area was just over 6.4 million, which makes it the most populated metropolitan area in Texas and the fourth most populous in the United States. Defined by the US Government as 12 counties (Collin, Dallas, Delta, Denton, Ellis, Hunt, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise), it is anchored on the east by the city of Dallas and on the west by Fort Worth. The Metroplex offers an entertaining array of Texana featuring everything from modern skyscrapers to old-fashioned cattle yards and essentially everything in between.
It is the home to many corporations, professional sports teams, a wide variety of nightlife, and a burgeoning arts community. The Metroplex is also the location of two award winning zoos, a world class aquarium, and several historically significant locations and museums.
The City of Dallas by itself is the ninth largest by population in the United States. It is the largest in size and population in The Metroplex, the county seat of Dallas County, and generally considered the center of the area. Some of the far northern areas within the City of Dallas extend into Collin County, which is directly north of Dallas County, and also into Denton County, which is northwest of Dallas County and directly west of Collin County.
Some of the cities and towns within and surrounding Dallas include:
Addison - Self proclaimed "Restaurant Capital of Texas" is a northern suburb
Allen - far northern suburb located in southern Collin County
Understand that Dallas/Fort Worth occupies a vast area of North Central Texas. Unlike the densely populated metro areas in the northern U.S. which house the bulk of their inhabitants in a relatively compact space, the Metroplex encompasses 9,286 square miles (24,100/km²), making it larger in land area than the states of Rhode Island and Connecticut combined.
Dallas-Ft Worth International Airport, (IATA: DFW)  The larger of the two airports and is located halfway between Dallas and Ft Worth along TX-Hwy 183 going east/west on the south end and TX-Hwy 114 going east/west on the north end. The airport terminals are accessed from both highways by International Pkwy (toll road). The airport serves as a hub for American Airlines (Terminals A,B,C,D) with flights going to/from all over the U.S., Canada, Latin America, & Europe. There is service by other major foreign (Terminal D) and other major domestic carriers (Terminal E) too. The airport is served by the DART Orange Line, which runs light rail trains from the airport at Terminal A directly into Downtown Dallas. It also accessed by the Trinity Express Railroad going east/west along the south between Dallas and Ft Worth at the Centerpoint station. From there, passengers continue to the terminals by shuttle bus. 
Dallas Love Field Airport, (IATA: DAL) . To avoid the headache of DFW, you can choose to fly in to the smaller Dallas Love Field which is located minutes northwest of downtown Dallas. With the repeal of the Wright Amendment Act the airlines are allowed to fly further beyond Texas and the adjacent states. The airport is served by Southwest, Virgin America, Delta Connection, and SeaPort and used by private executive/corporate jets and general aviation.
The smaller airport is:
Addision, (IATA: ADS) . Located 15 miles (24km) north of downtown Dallas on the North Dallas Tollway. It is a popular choice among the well-heeled corporate aircraft set.
Keep in mind that with the high traffic, delays are common so plan well ahead and allow some extra time for contingencies.
For those traveling by bus, Greyhound operates large terminals in both Dallas and Fort Worth, as well as smaller satellite terminals in the surrounding suburbs. Be aware, however, that the Downtown Dallas station has long been known by locals as a trouble spot and tends to attract transients and vagrants. Panhandling is a common occurrence and while the perpetrators are rarely violent, a high level of vigilance is strongly recommended for anyone who may pass through the terminal.
In addition several bus lines such as such as Autobuses Americanos, Turimex Internacional, El Expreso, and Tornado running routes from Dallas and Fort Worth across the US/Mexico border to regions in Mexico such as Monterrey, Guadalajara, San Luis Potosi, Zacatecas, Durango, Tampico, Mexico City, and Chihuahua.
The Metroplex is quite easily accessed by automobile. Interstate Highway 30 bisects the area west to east, and there are two branches of Interstate 35 that run north-south; I-35W through Fort Worth and I-35E through Dallas. In addition, Dallas is served by Interstate 45, which connects the area to Houston. The Metroplex is also served by several large US Highways and another score of Texas State highways.
For those new to the Metroplex, the area's elaborate highway system can be a bit confusing. The D/FW area has long had a tradition of naming numbered highways, e.g. U.S. Highway 75 is known as Central Expressway. The following is a fairly comprehensive list of the numbered freeways in the Metroplex and their corresponding names.
Interstate 20: Though officially named the "Lyndon B. Johnson Freeway", IH20 in Dallas is usually referred to as just "IH20", or simply "20".
Interstate 30: IH30 is known as the Tom Landry Freeway from the Tarrant County line until its interchange with IH35E in Downtown Dallas (known colloquially as the "Dallas Mixmaster"), where it becomes known as the East R.L. Thornton Freeway. Travelers must take note that south of the Mixmaster, IH35E is known as the South R.L. Thornton Freeway, a fact that may cause a bit of confusion.
Interstate 35E: North of the interchange with IH30 downtown, IH35E is known as the Stemmons Freeway.
Interstate 45: IH45 is known as the Julius Schepps Freeway.
Interstate 635: IH635, which forms a 3/4 loop around the city of Dallas, is known as the Lyndon B. Johnson Freeway, which is often shortened to the "LBJ Freeway" or simply "LBJ".
U.S. Highway 67: US 67 is known as the Marvin D. Love Freeway.
U.S. Highway 75: US 75 is known as Central Expressway.
U.S. Highway 80: US 80 is known simply as "Highway 80".
U.S. Highway 175: US 175 is known as the C.F. Hawn Freeway.
Texas State Highway Loop 12: Loop 12 is alternately known as Walton Walker Boulevard, Northwest Highway, Ledbetter Drive, Military Parkway and Kiest Boulevard. The stretch known as Walton Walker Boulevard is the only segment that is a limited access freeway.
Texas State Highway 114: SH114 is known as the John Carpenter Freeway.
Texas State Highway 183: SH183 is known as the Airport Freeway.
Texas State Highway 310: While not a true limited access freeway, SH310 is known as the S.M. Wright Freeway.
Texas State Highway Spur 366: Spur 366 is known as the Woodall Rogers Freeway.
The Dallas area is also currently served by two tollways: the Dallas North Tollway (colloquially known simply as "the Tollway") and the President George Bush Turnpike (generally referred to as "the Bush Turnpike"; also locally abbreviated as "PGBT"). These two tollways often provide a welcome respite from Dallas' famously bad traffic.
Interstate 20: In Arlington, IH20 is known as the Ronald Reagan Memorial Highway, and in Fort Worth IH20 is usually referred to as just "IH20", or simply "20".
Interstate 30: In Fort Worth, IH30 is known simply as the East Freeway or the West Freeway, with the line of demarcation being downtown. In Arlington and points east, it is known as the Tom Landry Freeway.
Interstate 35W: IH35W is simply known as the North Freeway or the South Freeway with the line of demarcation being downtown.
Interstate 820: IH820 is known as Loop 820 or the Loop, more specifically by the area of town it runs through. Thusly, a driver traveling north along the section of freeway on the eastern side of Fort Worth would be described as "traveling northbound on East Loop 820".
U.S. Highway 287: On the southeastern side of Fort Worth, US 287 is known as the Martin Luther King, Jr. Freeway.
Texas State Highway 114: In Grapevine and Southlake, SH114 is known as Northwest Parkway.
Texas State Highway 121 and Texas State Highway 183: A long stretch of SH183 co-signed with SH121 is known as the Airport Freeway.
Texas State Highway 360: In Arlington SH360 is alternately known as Watson Road and the Angus Wynne Freeway, but is generally just referred to as "360".
The Metroplex is notorious for its traffic congestion, so a traveler unfamiliar with the area should leave a significant time for error in learning the area. The worst times to be on the freeways in the D/FW area are the rush hour times, generally between 6-9 A.M. and 4-7 P.M. Traffic on the weekends is usually fairly pain-free, but it does not take much to cause a significant backup. Pay close attention to local television and radio for backup information.
The Dallas-Fort Worth Metroplex has more restaurants per capita than anywhere else in the United States. With the large immigrant and transplant population in the area it is also relatively easy to find different types of ethnic cuisine as well such as interior Mexican, Korean, Salvadoran, Chinese, Indian, Italian, Lebanese, Vietnamese, Thai, etc., although the heaviest concentration of those places tend to be in either Northwest Dallas, North Dallas or the various suburbs such as Garland, Richardson, Plano, Irving, Carrollton, and Arlington.
As with any large metropolitan area, The DFW Metroplex has its share of "street crime." Safer areas are the more affluent areas, including parts of west Fort Worth, most of Arlington, the northern suburbs, and the Park Cities of North Dallas. Areas that warrant some extra caution include South Dallas, parts of downtown Dallas, the areas close to Fair Park, as well as the East and Southeast parts of Fort Worth. Dallas, Forth Worth, and some other cities have interactive crime maps on their web sites.