# Common Type System

The .NET rules defining how types are declared, used, and shared across supported languages.

## What is **Common Type System** in C#?

**Common Type System** — The .NET rules defining how types are declared, used, and shared across supported languages.

Level: Master · [More C# terms at this level](https://www.ask-codey.com/glossary/subjects/c-sharp/master)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/common-type-system