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last_updated: "2026-08-04T14:21:38.000Z"
---

# Interfaces

Learn what interfaces are in C#, how to declare them, and how to implement and use them in classes.

 How to create interfaces and implement them in classes.

## 1. Interfaces

[Video](https://connect-mediagw.unity.com/h1/20220110/videos/c977e571-9428-477d-b30b-93d5f5c4ddbc_U_Intermediate_10_Interfaces.mp4)

**Interfaces**

```csharp
using UnityEngine;
using System.Collections;

//This is a basic interface with a single required
//method.
public interface IKillable
{
    void Kill();
}

//This is a generic interface where T is a placeholder
//for a data type that will be provided by the 
//implementing class.
public interface IDamageable<T>
{
    void Damage(T damageTaken);
}
```

**Avatar Class**

```csharp
using UnityEngine;
using System.Collections;

public class Avatar : MonoBehaviour, IKillable, IDamageable<float>
{
    //The required method of the IKillable interface
    public void Kill()
    {
        //Do something fun
    }

    //The required method of the IDamageable interface
    public void Damage(float damageTaken)
    {
        //Do something fun
    }
}
```