An impeachment is a formal charge of criminality raised against an elected official in the first step to remove them from office. In the federal government, only the House of Representatives may bring an impeachment while only the Senate may try and convict the accused. A conviction requires a two-thirds vote in the Senate and results in removal of the accused from office.
Impeachment can also occur at the state level, according to their respective state constitutions.
The impeachment process should not be confused with a recall election which is usually initiated by voters.