Hundreds of thousands of people have poured into Washington to watch Donald Trump being sworn in as the 45th US president.
All eyes were on the US Capitol as Mr Trump formally replaced President Barack Obama in the White House.Here is a guide to the historic transition.
What is a presidential inauguration?
The newly elected US president is sworn into office by the Chief Justice of the United States every four years by noon (17:00 GMT) on 20 January, as prescribed by the US Constitution.
The incoming president was historically inaugurated on 4 March, but the period of delay was shortened when the 20th Amendment was ratified in 1933.
The oath is part of a ceremony marking the peaceful transition of power on the steps in front of the US Capitol.
The ceremony is then followed by a parade down Pennsylvania Avenue and later celebrated through a series of inaugural balls.
Who is going to be there?
President Obama and the first lady accompanied Mr Trump in a motorcade to the US Capitol for the official ceremony, where they were joined by members of Congress, politicians as well as supporters.
Former President Bill Clinton and Hillary Clinton, who lost to Mr Trump in November's election, are attending.
George W Bush and his wife, Laura, as well as Jimmy Carter are also there.
George HW Bush, who was in hospital for respiratory problems, wrote a letter to Mr Trump wishing him well and apologizing for missing the event due to health concerns.
An estimated 800,000 to 900,000 people are expected to flood the nation's capital on Friday for the inauguration, but it is unclear whether they will be there in celebration or protest, officials said.
President Barack Obama drew an estimated 1.8 million people to Washington when he took office eight years ago.
The "level of enthusiasm" and demand for hotel rooms has not reached that of previous inaugurations, according to Elliott Ferguson, president of Destination DC, the city's convention and tourism bureau.
In fact, some hotels have reduced the minimum-night stay from four nights to two.
Other hotels are only 50% full, but higher-end hotels appeared to have more bookings, he added.
Who is not going?
More than 50 House Democrats are publicly refusing to attend the ceremony amid a feud between the newly elected president and the civil rights activist and congressman, John Lewis.
Mr Lewis is among the congressmen who will not be in attendance. Some lawmakers have said they will instead attend the Women's March on Washington, a protest set to take place a day after the inauguration.
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