A cable lock is a flexible anti-theft solution that literally and figuratively gives you a bit of room, and we distinguish two main categories.
Cable locks with single security: essentially a braided steel cable.
Double security cable locks, where the braided steel cable is additionally enclosed by hinged sleeves made from hardened steel.
It is obvious that this double layer of security makes a theft attempt more cumbersome and difficult.
Cable locks are longer than a U-lock or disc brake lock and therefore your best, if not only option to attach the bike to an anchor point. Unfortunately: every lock can be opened by force. The trick is to make theft a challenge and time-consuming, discouraging potential thieves. Combining different locks is always a good idea.