Domain hijacking is the process by which internet domain names are stolen from the rightful registrant.
Many people confuse domain hijacking with the re-registration of an expired domain by a new party. One is a legal process and one is not. Domain hijacking is theft, while if a name owner does not renew a name he or she is no longer the owner and it is available for someone else to register.
There are many websites on internet which keep publishing list of expired domain names or domain names which will be expired soon. Using this information domain hijacking is done.

Domain theft
Domain theft is an aggressive form of domain hijacking that usually involves an illegal act. In most cases, identity theft is used to trick the domain registrar into allowing the hijacker to change the registration information to steal control of a domain from the legitimate owner.
Some registrars are quick to set things right when these cases are discovered. However, it is well documented that some registrars will admit no fault in accepting the forged credentials and will refuse to correct the record until forced by legal action. In many of these cases, justice is not done and the hijacker retains control of the domain. The victims of such theft often do not have the resources or willingness to invest the effort necessary to regain control of their domain, which may require a lawsuit or a lengthy and time-consuming arbitration process, especially if the hijacker and victim are in different countries. People that have hijacked a domain can do anything with that name, including putting up their own website or redirecting those who visit the address to another site. Sometimes hijacker may ask for huge amount of money to giving back domain names.

Always keep track of Domain expiry date renew domain in time.

Tags: Domain Hijacking, domain theft, expired domain threat