Fusion Summon

A Fusion Summon ( Yūgō Shōkan) is the act of Special Summoning a Fusion Monster from your Extra Deck using "Fusion" or any other card effects which explicitly states that the Summon is a Fusion Summon.

In the anime
While visual depictions of Fusion Summons have varied significantly among the different anime series, most generally show the Fusion Materials, or their cards, being warped into particles or forms of energy in a spiral direction, which then merge with each other within a spiraling portal, from which the Fusion Monster emerges. It is not until Yu-Gi-Oh! ARC-V where a standardized version of this method is adopted for all Fusion Summons, with the portal consisting of blue and orange swirls of energy, referencing the artwork of "Fusion", and the Fusion Material Monsters transforming into differently colored forms of energy (usually the colors being contrasting ones like blue/red, yellow/violet, etc.), which then swirl together into a spiral before entering the portal. Fusion Summon practitioners usually clash their hands together at the moment the monsters combine, seemingly mirroring that the materials become one.

In Yu-Gi-Oh! ARC-V, a Fusion Summon performed using Fusion Materials that have been previously Pendulum Summoned is referred to as a "Pendulum-Fusion".