Domain locking is like "anchoring" a boat. If a boat is anchored, nothing can move it and it'll stay put. If it is not anchored, it could drift elsewhere. Same case with domain locking - when a domain is locked, then your domain name is bound to your domain registrar. If it is unlocked, then your domain name may be transferred to another registrar. Locking a domain prevents unauthorized domain transfers. Most domain registrars lock your domain once it is registered, until you notify your registrar to unlock it (in the case that you want the domain to be transferred to a new registrar.
