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# C# Classes for Behaviours

Learn how classes organize functionality into modular code using object-oriented programming.

In this tutorial, you will be introduced to classes. These are a key part of object-oriented programming, breaking functionality into modular segments of code.

## 1. Classes for Behaviours

[Video](https://connect-mediagw.unity.com/h1/20190529/videos/ff9c2e3f-b3c8-4029-983d-f0c80fc89d5c_00_Classes_for_Behaviors.mp4) ([Transcript (en)](https://connect-mediagw.unity.com/h1/20200212/24d42ea8-f545-48c6-9173-5dd175ca359a_00_Classes_for_Behaviors.vtt))