Webmail allows users to access their email accounts from any internet-connected computer rather than using a local email program. With webmail, emails are stored on the provider's server and viewed online rather than being downloaded to the local machine. The main advantages of webmail are that it can be accessed anywhere, requires no special software, and keeps emails backed up and secure on the server. However, webmail also has the disadvantages of requiring an internet connection and being limited by the server's disk space allocation. It is important for users to regularly clean up their webmail folders to avoid filling their mailbox, which would prevent sending and receiving emails.