The District of Columbia, commonly referred to as D.C., is the capital of the United States and the seat of the federal government. It is located on the Potomac River between Maryland and Virginia, and is bordered by both states. The city covers an area of 68.3 square miles, making it the smallest state in the country.

D.C. is home to many iconic landmarks, including the White House, Capitol Building, Washington Monument, Lincoln Memorial, and Smithsonian Institution. The city also has a vibrant cultural scene with numerous museums, galleries, theaters, and music venues.

The population of D.C. is estimated at 693,972 people as of 2020. The city has a diverse population with African Americans making up 47% of the population and whites making up 38%. Other ethnic groups include Hispanics (10%), Asians (4%), and Native Americans (1%).

The economy of D.C. is largely driven by government activities and tourism. The city also has a thriving technology sector with many startups based in the area. Additionally, D.C.'s education system is highly regarded with several prestigious universities located in the city such as Georgetown University and George Washington University.

D.C.'s climate is classified as humid subtropical with hot summers and mild winters. Average temperatures range from lows in the mid-30s during winter to highs in the mid-80s during summer months. Precipitation levels are generally moderate throughout the year with snowfall occurring occasionally during winter months.