Domain locking prevents your domain from becoming victim to domain name thieft. If you have a sucessful website and you are attracting lots of visitors to your site, there is a potential for someone to want to transfer your domain to another account so they can create a web site the looks just like your but used for collecting user details such as e-mail addresses. The end user thinks they are going to the orginal site but in fact they are going to the fake one. The details collect my be used to "spam" your clients or in some case. they may try and use the details to log into their real accounts and disrupt your sucessfull business. Either way, your clients will lose faith in you and may look elsewhere for business.
How does this service work? If a request is made to change any of the details associated with your domain name. Apex has to contact the registrar to request this change. The registrar then has to contact the domain authority. This gives two levels of checks before any changes are made. So if someone tries and change the administration contact details. Only the domain authority can make the changes. More commonly, the DNS servers that are giving out the web servers address is changed so that the fake web servers address it given out instead. In order for this change to occur, Apex Web Solutions will have to request the change, then the domain registrar, submitts a change request to the domain authority who then confirm the request with the registrar using a passcode. Once all the checks are verified, then and only then can the change to the domain records be made.