If a property is Temporarily Off the Market (TOM) it means the owner took the house off the market but should be putting it back to "active".
If the house was Withdrawn from the market, the owner may have decided not to sell or on a short sale it's possible the owner got a loan modification to allow them to reduce the monthly payment.
If the house is "pending" sale that means another buyer made an offer and it was accepted by the Seller so there is now a contract pending sale.
What address are you looking at? I may be able to tell you what is going on or if you're already working with a Realtor she should be able to help you.
Hope this helps.
Alma Rose Kee, P.A.
Charles Rutenberg Realty, Inc.