👉 Checkpoint in computer science refers to a data structure used for storing and retrieving values that are currently being processed. It is similar to a stack, but instead of pushing elements on top, it pops them off at the end. In other words, a checkpoint stores the current value of an element while allowing you to retrieve it later. This can be useful for scenarios where you want to access or modify an existing element without needing to recompute its value every time. For instance, in a database system,