What is what does it mean when a person is unavailable on messenger?

When a person is unavailable on Messenger, it means that they are not currently active or online on the messaging platform. This could be due to several reasons, such as:

1. The person has turned off their online status or set themselves as "unavailable" to specific individuals or everyone on their contact list.
2. The person has logged out of Messenger or the messaging app on their device.
3. The person's device is turned off or they are currently not connected to the internet.
4. The person has set their status to "away" or "busy" on Messenger, indicating that they are not currently available to chat.
5. The person has blocked you or removed you as a contact on Messenger, preventing you from seeing their online status or contacting them.

Overall, being unavailable on Messenger simply means that the person is not currently reachable or active on the platform.