By changing the security settings, you can customize how Internet Explorer helps protect your PC from potentially harmful or malicious web content. Internet Explorer automatically assigns all websites to a security zone: Internet, Local intranet, Trusted sites, or Restricted sites. Each zone has a different default security level that determines what kind of content might be blocked for that site. Depending on the security level of a site, some content might be blocked until you choose to allow it, ActiveX controls might not run automatically, or you might see warning prompts on certain sites. You can customize the settings for each zone to decide how much protection you do or don't want.