When an active domain name expires, it can still be renewed by its present owner for about sixty days following the expiration and although it will not be active, it cannot be taken by someone else. When the domain name is not renewed by then, however, it enters a 5-day deletion period and subsequently it is released to the public. Throughout the deletion period everyone will be able to send a backorder for the domain name through an ICANN-accredited domain registrar and the service provider will use its registry channel in order to attempt to register the domain name for the user as soon as it's available. Since lots of registrars could attempt to obtain a given domain and names are acquired on first-come, first-serve basis, there isn't any guarantee that using such a computerized service will grant you possession over it, yet this is the best way to get an appealing domain name because trying to register it personally almost certainly means that you will be too late.