What does the "Reply to All" function do in most email programs?

What does the "Reply to All" function do in most email programs?
What does the "Reply to All" function do in most email programs?
It does literally what it says.





If you have an email and it was sent to multiple people, clicking 'reply to all' will send your email to all of the email addresses.
Reply:Replies to everyone in your address book I believe.