what is the Recursive trigger and how to handle it?

Trigger when called over and over then its called recursive trigger.Below error will be display
if not controlled.

error message : maximum trigger depth exceeded

ex : Recursive code

Trigger AccountTrigger on Account(before insert)
{
    insert new Account(Name='test');

}

How to stop it ?

In order to avoid the situation of the recursive call,make sure your trigger is getting executed only one time.To do so, you can create a class with a static Boolean variable with default value true.

In the trigger,before executing your code keep a check that the variable is true or not.once you check,make a variable false.

ex :

public class checkRecursive
{

  private static boolean run=true;

  public static boolean runOnce()
  {
     if(run){
         run=false;
        return true;
      }
      else
       {
         return run;
       }

  }

}

Trigger AccountTrigger on Account(before insert)
{

    if(checkRecursive.runonce())
      {
        insert new Account(Name='test');
      }

}