Immutable

In programming, "immutable" means that once a piece of data is created, it cannot be changed or modified. Think of it like a printed document; if you want to make updates, you need to create a new version rather than altering the original. This ensures that the original data stays the same, providing stability and consistency, especially in complex systems where multiple processes might access the same information. Immutable data helps prevent errors caused by unintended changes, making programs more reliable and easier to debug.