Medic (6v6)
Medic is most commonly thought of as the most important class in all of TF2. He leads the pushes in order to cap more points and to destroy the enemy team. His job is to provide healing to his teammates as well as provide them with overheals, also known as buffs. In 6v6, the medic usually uses one of two different secondaries. The Medigun, which makes the player on the receiving end of the healbeam invincible, and the Kritzkrieg, which grants critical hits to all attacks done by the player being pocketed. The Kritzkrieg is usually given to the Demoman in order to drop the other teams medic and kill as many of the enemy team as possible due to his large clip size and high damage output. The medic usually has a player assigned to protect him, known as the pocket. The pocket, usually a soldier, receives the majority of the Medic's Ubers.
placeholder from the main med page
Addition: Because of the recent update where the quick fix got buffed, Some medics prefer to use the quick fix to improve the time it takes to get there, and also to distribute nearly good heals at mid (Trading focusing one player and fully buffing for being able to heal 2 or 3 at a time with half a buff).