Update Contacts When Parent Account’s Industry Changes

Using asynchronous Apex, this trigger updates related Contacts when an Account’s Industry field changes to “Biotechnology.” It ensures synchronization across records.

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Solution:
trigger AccountTrigger on Account (before insert, before update, after update,         after insert, after undelete)
{

        if(Trigger.isAfter && Trigger.isInsert) {
             Account TriggerHandler.handleAfterInsertActivities (Trigger.NEW);
}
       if(Trigger.isBefore && Trigger.is Insert) {
            Account TriggerHandler.handleBeforeInsertActivities (Trigger. NEW);
  }
                  if(Trigger.is Before && Trigger.isUpdate) {
                       AccountTriggerHandler.handleBeforeUpdateActivities (Trigger.                                 NEW, Trigger.oldMap);
  }
                  if(Trigger.isAfter && Trigger.isUpdate) {
                  if(!Account TriggerHandler.isRunOnce) {
                                  Account TriggerHandler.isRunOnce = true;
                                  Account TriggerHandler.handleAfterUpdateActivities (Trigger.NEW, Trigger.oldMap);
      }
}