The thing is POP3 is a mail protocol while Webmail is a web based email service or client like Gmail and Yahoo which you can access by using a browser.
Though webmail services usually uses the IMAP mail protocol so to differentiate:
Post Office Protocol 3 (POP3) downloads the emails from the mail server to your local device while Internet Message Access Protocol (IMAP) allows you to view your folders and emails from the mail server. Also POP3 only lets you access your mail on a single device at a time while IMAP on the other hand synchronizes your mails across multiple devices which is quite convenient.
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Answer:
The thing is POP3 is a mail protocol while Webmail is a web based email service or client like Gmail and Yahoo which you can access by using a browser.
Though webmail services usually uses the IMAP mail protocol so to differentiate:
Post Office Protocol 3 (POP3) downloads the emails from the mail server to your local device while Internet Message Access Protocol (IMAP) allows you to view your folders and emails from the mail server. Also POP3 only lets you access your mail on a single device at a time while IMAP on the other hand synchronizes your mails across multiple devices which is quite convenient.