I have Two List of object records.
List<Account> accList1 = {1st record, 2nd record, 3rd record, 4th record};
List<Account> accList2 = {1st record, 3rd record};
 
I have another List<Account> accList3 = new List<Account>()
now I want to compare both List list1 and list2, get the record from list1 which is not present in list2 and add to List3.