Impeachment Basics

From The U.S. Constitution:
Section 4 - Disqualification
The President, Vice President and all civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors.


Impeachment(definition)
Impeachment, in the U.S. and Great Britain, proceeding by a legislature for the removal from office of a public official charged with misconduct in office. Impeachment comprises both the act of formulating the accusation and the resulting trial of the charges; it is frequently but erroneously taken to mean only the removal from office of an accused public official. An impeachment trial may result in either an acquittal or in a verdict of guilty. In the latter case the impeached official is removed from office; if the charges warrant such action, the official is also remanded to the proper authorities for trial before a court. Source:FWE

From Wikipedia:

Impeachment in the United States is an expressed power of the legislature that allows for formal charges against a civil officer of government for crimes committed in office. The actual trial on those charges, and subsequent removal of an official on conviction on those charges, is separate from the act of impeachment itself.

Impeachment is analogous to indictment in regular court proceedings, while trial by the other house is analogous to the trial before judge and jury in regular courts. Typically, the lower house of the legislature will impeach the official and the upper house will conduct the trial.

At the federal level, Article Two of the United States Constitution (Section 4) states that "ThePresident, Vice President, and all other civil Officers of the United States shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other High Crimes and Misdemeanors." The House of Representatives has the sole power of impeaching, while the United States Senate has the sole power to try all impeachments. The removal of impeached officials is automatic upon conviction in the Senate.