URLs, or Uniform Resource Locators, serve as web addresses. They come in various types, each with distinct purposes. First, there are HTTP/HTTPS URLs, commonly used for websites like "http://www.example.com". Then, FTP URLs facilitate file transfers, such as "ftp://ftp.example.com". Additionally, mailto URLs initiate email messages, as in "mailto:[email protected]". File URLs point https://bf.do4a.me/proxy.php?link=https%3A%2F%2Fspwebdesign.live/