OppRecursion

trigger OppRecursion on Opportunity (after update) {

    // Create empty opportunity list
    List<Opportunity> oppsToUpdate = new List<Opportunity>();

    //Create empty set
    Set<Id> oppIds = new Set<Id>();

    // Iterate through selected opp records
    for (Opportunity opp : Trigger.new){
        oppIds.add(opp.id);

    }

    // Fetch selected records
    List<Opportunity> opportunityList = [select Id, Description from Opportunity where Id in:oppIds];

    for (Opportunity opportunityRecord:opportunityList){
        //The description will always be updated to Test every time the record is updated
        //This causes recursion because updating the field triggers the after update trigger
        //How can we stop the recursion?
        opportunityRecord.Description = 'Test';
        oppsToUpdate.add(opportunityRecord);

    }

    if (!oppsToUpdate.isEmpty()){
        update oppsToUpdate;
    }


}