Effect (属性, attribute) is the term used to refer to what kind of elemental properties an attack applies to what it hits. For example, attacks with the freezing effect can freeze opponents, while those with the flame effect produce fiery visuals and trigger fire-based interactions. Most attacks use the normal or slash effects, which have only cosmetic results.
The origin of the term "effect" is unclear. It is believed to come from how it determines whether an attack can apply status effects to opponents, such as freezing, burying, or using the Screw Attack. It could also relate to a basic visual system in most video games known as particle effects, which would pertain the aesthetic flair of attacks in Super Smash Bros.
List of effects
Introduced in Super Smash Bros.
Introduced in Super Smash Bros. Melee
Introduced in Super Smash Bros. Brawl
Introduced in Super Smash Bros. 4
Introduced in Super Smash Bros. Ultimate