"mailto" is just a fancy way of making an email link on a website. Think about it like a secret code that helps your computer understand that you want to send an email to someone. When you click on a "mailto" link, it opens up a new email message in your email program, like Gmail or Outlook. All you have to do is type in the person's email address, add a subject line and type your message like you normally would. Then just hit "send" and your email will be on its way! It's a really easy and convenient way to send emails from a website.