Web-based E-mail - E-mail providers that you have to be directly connected to the the web to read.  With a standard e-mail address through your ISP, (often called POP or POP3,) you need only be connected to the Internet but not the web.  The big advantage to this is that if you change ISPs, you won't lose your e-mail address.  Also there are software programs that can forward your web-based e-mail automatically to your ISP’s (POP3) e-mail address/client.  (It's called "forwarding.")  The following is a web address that, at the time of this writing, was the ultimate list of places to get free e-mail addresses (and those that can be forwarded.) www.emailaddresses.com.