Transferring an already registered domain entails changing the domain name registrar that provides the domain registration service, so after the transfer itself, you will have to manage things like renewal payments or DNS resource record updates through the new registrar company. The transfer process itself is standard with most universal and country-specific domain name extensions. Some country-code extensions are more specific and entail different procedures, but in the general case transferring a domain involves several necessary steps and one of them is unlocking the domain. The lock is a safety feature, which is being embraced by more and more registry organizations. It’s a standard feature supported by all gTLDs. If a domain is locked, it won’t be possible to start a transfer process, so nobody can even attempt to take your domain name. The lock can be removed only through the account where the domain is registered and all new domain names that support this feature are locked by default the moment they are registered.