In Unity 3D modeling, prefabs are reusable templates for 3D objects (or grouped hierarchies) that store components, properties, and setup—acting as a master version of an asset you can reuse across your project.
Editing the prefab updates all its instances automatically, eliminating repetitive tasks like tweaking 50 identical trees or enemies one by one.
Prefabs are ideal for assets you need in bulk (e.g., coins, pickups, props) and help streamline your workflow by keeping designs consistent and saving time on duplication.