Washington
In short
Washington is the capital city of the United States, serving as the seat of the federal government.
In plain words
It is a large city where the President lives and works. It is also where the country's most important laws are made and debated.
A simple example
When the US government decides to pass a new national law, the discussion and voting happen in buildings located in Washington.
Why it matters
It is the centre of political power for the United States. Decisions made here affect people and economies all over the world.
Easy to mix up
People often confuse Washington, D.C. with Washington State, which is located on the west coast of the country.