Case locking in pega

What is the case locking mechanism in pega?

Pega case locking prevents conflicts when a user attempts to submit cases that are already updated, this is the "Default locking" strategy in pega. Allowing only one user to open the case and work while the second user tries to open the same case pega displays a locking message saying that the case is being locked by the first user. However, the second user still can open the case in read-only mode. When the first user opens the case, the case acquires the lock and by default, pega locks the case for 30 mins or until the user closes the case or submits the case whichever comes first.