# Update()

> Update is called every frame, if the MonoBehaviour is enabled.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)

```csharp
public void Update()
```

### Remarks

Update is the most commonly used function to implement any kind of game script. Not every `MonoBehaviour` script needs `Update`.

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

// The ExampleClass starts with Awake.  The GameObject class has activeSelf
// set to false.  When activeSelf is set to true the Start() and Update()
// functions will be called causing the ExampleClass to run.
// Note that ExampleClass (Script) in the Inspector is turned off.  It
// needs to be ticked to make script call Start.

public class ExampleClass : MonoBehaviour
{
    private float update;

    void Awake()
    {
        Debug.Log("Awake");
        update = 0.0f;
    }

    IEnumerator Start()
    {
        Debug.Log("Start1");
        yield return new WaitForSeconds(2.5f);
        Debug.Log("Start2");
    }

    void Update()
    {
        update += Time.deltaTime;
        if (update > 1.0f)
        {
            update = 0.0f;
            Debug.Log("Update");
        }
    }
}
```

In order to get the elapsed time since last call to Update, use [Time.deltaTime](/engine/6000.7/script-reference/unityengine/time/deltatime.md). This function is only called if the [Behaviour](/engine/6000.7/script-reference/unityengine/behaviour.md) is enabled. Override this function in order to provide your component's functionality.