After a Campaign has been sent, there are some reporting options you can see for each individual Campaign.
First, you will find the sent Campaign on the Communication tab and click into it.
You will see the details of the Campaign Communications and the reporting on the Email Performance once it was sent. The Email Performance shows:
Recipients: How many unique contacts were intended to receive this email.
Delivered: How many unique contacts successfully received this email.
Open Rate: The Percentage of successfully delivered emails that were opened.
Click Rate: The Percentage of successfully delivered emails that were clicked.