A webmail app lets you send and receive e-mails via browser without having to set up an e-mail address inside an app such as Thunderbird or Outlook. If you travel, for instance, you'll be able to check your emails from an Internet café and you will not have to download, install or set up anything. Webmail apps are advanced enough to offer you a number of options like using an address book or creating folders that will later on come in your email client. As the webmail software works with the messages on the server, it is necessary that you employ the IMAP protocol any time you configure an email account on your PC. You may still use webmail if you select POP, but older emails will not be available because they'll have been downloaded on the PC. You can take advantage of webmail provided that there is any sort of e-mail created with your web hosting account and using an email app prior to being able to use webmail isn't a prerequisite, so that you can manage your electronic communication completely from a browser.