What does sender email mean ?

i need to know what sender email means 

The sender email is the email address that would send your notification or autoresponder email.

By default, our own sender email is set to send your emails.

It is possible to change the sender email to your preferred email address.

Kindly check this guide:https://www.jotform.com/help/238-How-to-Add-a-Custom-Sender-Address-to-an-Email-Alert

Hope this information helps.

If you need further assistance, let us know.