I am assuming you mean "default". This is when a person who has a mortgage commitment with a bank has not paid their bill. Sometimes it's because you no longer can afford the payment, because the home is now worth less than you paid for it, or for other personal reasons. If you are more than 30 days late, this can affect your credit rating in a negative way.
If you are in this situation, it's best for you to contact the Loss Mitigation Dept. at the bank and let them know what is going on and wh you were unable to pay. They may make arrangements to assist you, or tell you what must be done so you do not face a foreclosure. I hope this helps. - Thu Oct 22, 2009