Depreciated and deprecated are two terms used in software development, but they have different meanings. Depreciated refers to something that has lost its value or is no longer in use, often due to being replaced with a newer and better alternative. On the other hand, deprecated refers to something that is still in use but is discouraged or recommended against by the software developers. It is a way of indicating that the feature or functionality may be removed in future versions of the software. So, in summary, depreciated means something is no longer in use or has lost its value, while deprecated means something is discouraged but still in use.