# Signals and computed

A signal holds a value that changes, and tells Angular when it does, so the page always shows the latest. Read it by calling it, change it with set or update, and derive values from signals with computed, which recalculates by itself.

![Cheat sheet: Signals and computed](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/a217d1d80974412bbc9867c26faf0ae5.webp)

- Category: Angular
- Level: Apprentice
- Tags: angular, computed() (angular), Signal (angular)
- Updated: November 3, 2026

Source: https://www.ask-codey.com/cheat-sheets/state-with-signals-signals-and-computed-cheat-sheet