The detailed statics allow you to see the statistics for one user, who open what when and how many times.
Send date : The date that the email has been sent.
Name : The name of the email, if it's a campaign you can click on it to go on the summary of it.
User : The email of the user, if you click on it you can edit the user.
Opened : The number of time the user opened the email.
Open date : The date the user opened the mail.
Sent : If the mail was sent there is a green check and if not there is a red icon.