President Calvin Coolidge's inauguration was the first to be broadcast live on the radio. A lot has changed since then.

Donald Trump and J.D. Vance will become the 47th president and 50th vice president of the U.S., respectively, at the inauguration on Jan. 20. Here's everything to know about the 2025 presidential inauguration.

When a president is re-elected, they must take the oath of office again, meaning there is another inauguration every four years on Jan. 20.