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 forms of energy that match their respective colors, which then swirl together into a spiral before entering the portal.

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".