To effectively manage and coordinate multiple animations, Anime.js introduces the concept of timelines. A timeline in Anime.js acts as a container for several animations, allowing you to organize their order and control how they overlap or run in sequence. This is especially useful when you want to build complex animation flows, such as animating several elements one after another, or having some animations run at the same time while others wait their turn.

With timelines, you use terms like add, which means inserting an animation into the timeline, and offset, which lets you control exactly when an animation should start relative to others. This provides you with a powerful way to choreograph animations without writing complicated callback logic or managing delays manually. Timelines are essential for building coordinated, professional-looking motion in your web projects.