Washington, D.C., also known simply as Washington or D.C., is the capital city of the United States of America. Here are some key details about Washington, D.C.:

• Location: Washington, D.C. is located on the east coast of the United States, on the northern bank of the Potomac River, bordered by the states of Maryland to the northwest and Virginia to the southwest. It is approximately 370 kilometers (230 miles) southwest of New York City and 240 kilometers (150 miles) northeast of Richmond, Virginia.
• Population: As of the most recent data, the population of Washington, D.C. is estimated to be around 700,000 people, making it the 20th most populous city in the United States.
• Climate: Washington, D.C. has a humid subtropical climate, with hot, humid summers and mild winters. The average temperature ranges from around -2°C (28°F) in January to around 26°C (79°F) in July.
• Economy: Washington, D.C. is a major political and cultural hub, with a diverse and robust economy. Key industries include government, tourism, finance, education, and healthcare. The city is home to many federal government agencies, including the White House, the U.S. Capitol, and the Supreme Court.
• Transportation: Washington, D.C. has an extensive transportation network, including buses, trains, and taxis. The city is also served by three major airports, Ronald Reagan Washington National Airport, Washington Dulles International Airport, and Baltimore/Washington International Thurgood Marshall Airport.
• Culture and Attractions: Washington, D.C. has a rich cultural heritage and is home to many historic landmarks and cultural attractions. Some popular attractions include the National Mall, the Smithsonian Institution museums, and the Lincoln Memorial. The city also has a vibrant arts scene, with many theaters, galleries, and music venues.
• Language and Culture: English is the official language of Washington, D.C., and it is the most widely spoken language in the city. The city has a diverse cultural scene, with influences from various ethnic groups and religions.
• Cuisine: Washington, D.C. is known for its diverse and flavorful cuisine, which includes a mix of traditional American dishes as well as international cuisines. Some popular dishes include half-smokes (a type of sausage), Maryland blue crab, and Ethiopian injera (flatbread).
• Education: Washington, D.C. is home to several prestigious educational institutions, including Georgetown University, George Washington University, and Howard University. The city also has a number of public and private schools, offering education from preschool to high school.
• Safety: Washington, D.C. is generally considered to be a safe city for tourists and residents alike, with a relatively low crime rate compared to other major cities in the United States. However, it's always a good idea to take common-sense precautions, such as avoiding isolated areas at night and not flashing valuables in public.