Joe Biden will take oath as 46th President of the United States in Washington today (Wednesday).
Kamala Harris will also be sworn in as Vice president of the country.
US President Donald Trump made his farewell address before leaving office.
Meanwhile, security has been ramped up in Washington and large sections of the city have been closed off.
The Secret Service has taken command of the security plans, backed up by some 15,000 National Guard troops, in addition to thousands of police officers.
Washington DC is already under a state of emergency and will remain that way through inauguration.