Question

What do you mean by chat pinned in WhatsApp? Don't spam either I will report your answer. ​

Answer 1

Answer:

The pin chat feature in WhatsApp allows users to pin favourite chats on top of the Chats tab. With the new feature, WhatsApp users can pin up to three contacts on top of rest of the conversations. ... Users will be able to see any new chats or conversations following the pinned chats.

Answer 2

pinning a person in Whatsapp is that the person's contact will be always in the top. if there is many messages for others.

Hope it will be helpful.