How can you create a custom Angular builder?

Short answer: Angular CLI supports custom builders to extend build behavior. Create a Node.js package implementing the Builder interface. Define builder options and logic in a builders.json. Use the custom builder in angular.json for build or serve targets. Use case: Customized builds, code analysis, or special deployment pipelines.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.