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Showing content from https://docs.unity3d.com/Manual/sprite/../../ScriptReference/Coroutine.html below:

Unity - Scripting API: Coroutine

class in UnityEngine

/

Inherits from:YieldInstruction

/

Implemented in:UnityEngine.CoreModule

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MonoBehaviour.StartCoroutine returns a Coroutine. Instances of this class are only used to reference these coroutines, and do not hold any exposed properties or functions.

A coroutine is a function that can suspend its execution (yield) until the given YieldInstruction finishes.

using UnityEngine;
using System.Collections;
public class ExampleClass : MonoBehaviour
{
    IEnumerator WaitAndPrint()
    {
        // suspend execution for 5 seconds
        yield return new WaitForSeconds(5);
        print("WaitAndPrint " + Time.time);
    }
    IEnumerator Start()
    {
        print("Starting " + Time.time);
        // Start function WaitAndPrint as a coroutine
        yield return StartCoroutine("WaitAndPrint");
        print("Done " + Time.time);
    }
}

This example shows a normal Start:

using UnityEngine;
using System.Collections;
// In this example we show how to invoke a coroutine and execute
// the function in parallel.  Start does not need IEnumerator.
public class ExampleClass : MonoBehaviour
{
    private IEnumerator coroutine;
    void Start()
    {
        // - After 0 seconds, prints "Starting 0.0 seconds"
        // - After 0 seconds, prints "Coroutine started"
        // - After 2 seconds, prints "Coroutine ended: 2.0 seconds"
        print("Starting " + Time.time + " seconds");
        // Start function WaitAndPrint as a coroutine.
        coroutine = WaitAndPrint(2.0f);
        StartCoroutine(coroutine);
        print("Coroutine started");
    }
    private IEnumerator WaitAndPrint(float waitTime)
    {
        yield return new WaitForSeconds(waitTime);
        print("Coroutine ended: " + Time.time + " seconds");
    }
}

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