What type of lock do I need?

Deadlocks are fitted to doors without handles. For example, if your door can be opened using keys only and do not require a handle then a deadlock is what you need.

Deadlock

Mortice sash locks are fitted to doors which have both a lock and a handle. If you need to unlock your door and turn a handle then a mortice sash lock is what you are looking for.

Sash lock