Bounce - is a message that is returned to the server that sent it. Bounced emails are either a permanent failure to deliver the email or temporary failure to deliver the email, based on conditions with the recipient mail server.
Hard Bounces - A hard bounce is an e-mail message that has been returned to the sender because the recipient’s address is invalid.
The soft bounce is an e-mail message that gets as far as the recipient's mail server but is bounced back undelivered before it gets to the intended recipient. A Soft bounce might occur because the recipient's inbox is full.
Open the is a percentage that tells you how many successfully delivered campaigns were opened by subscribers.
Email “Clicks” are shown in your reports when people are clicking on your links in your message content.
Unique opens do not take repeat opens into account.