Two-phase locking

Two-phase locking is a way of keeping track of who is using which data. It's like a rulebook that all computers in a network must follow whenever they want to use a certain piece of data. It makes sure that two computers aren't using the same data at the same time, which could cause errors and problems.

Basically, it's like two phases of a game. In the first phase, all computers involved must agree and “lock” the data they want to use. This means that nobody else can use the same data until they are done with it. In the second phase, all the computers can use the data they’ve locked.

This two-phase locking system helps keep things organized and running smoothly, so it’s easier to work together with computers in a network.