Summon

A Summon is when a monster  is played onto the Monster Card Zone face-up  under specific cases, effects or conditions use this term.

In the game, there are a number of different types of Summons. So far, those are the only actions that considered a Summon: Fusion, Ritual, Synchro and Xyz Summon are a form of Special Summon. And Tribute Summon is form of Normal Summon.
 * Normal Summon
 * Tribute Summon
 * Flip Summon
 * Special Summon
 * Fusion Summon
 * Ritual Summon
 * Synchro Summon
 * Xyz Summon

Flip and Special Summons may be conducted as many times as you would like per turn, unlike Normal Summons, which can only performed once per turn.