Web-mail is also referred to as web-based email services. This service is primarily meant to access via a web browser. An interface which allows you to check emails over the internet using a browser is called a web-mail. Typical users depend on mail clients like Outlook, Thunderbird etc. which are desktop utilities. Web mail is a browser based interface. Squirrel mail, Horde and Neo mail are some of the most popular web-mail interfaces.