Quicken is an Elemental Reaction in Genshin Impact that involves Electro and Dendro. All teams seeking to utilize this Elemental Reaction must have characters that use both elements.
It is worth mentioning that it doesn't matter if Dendro is applied after Electro or vice versa. As long as an enemy is hit by both elements, a Quicken aura will be applied to them.
From there, players can trigger either of the following two Elemental Reactions in Genshin Impact: Spread or Aggravate. Hitting an enemy that has Quicken with Dendro would trigger Spread.
Alternatively, using Electro in that scenario would trigger Aggravate. The main goal of a Quicken team in Genshin Impact is to fully utilize the Dendro and Electro elements.
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