classified

When something is classified, it means that it's been grouped or sorted into a particular category or group.

Imagine you're trying to find a specific book on your shelf. You might look at the spine and see that it says "Fiction" which helps classify what type of book it is. But in more formal situations, like when someone looks at personnel records or official documents, classified usually means secret or private information that's not meant for everyone to see. This can be because the info is sensitive or confidential.

There are a few ways this word gets used depending on the context.