An approval process maps the steps for approving a record, like an account, and identifies the person who approves each step. The approval process can send an approval request as a Chatter post. You can create a template for that post to ensure that the same type of data is posted with every request.
To enable Approval requests in Chatter:
If any of your users opt out of receiving approval request posts, then those users don’t see them in their own feed.