You can use the anchor element to link to any Web resource. Hyperlinks to pages on the same Web site are usually made with relative paths. For example, here is a link to the formatted Web page.
Hyperlinks to pages on another Web site require a URL, like this link to Google.
You can use the target attribute to open a Web resource in a new browser window, like this link to Yahoo!
You can create a link to an e-mail address, like this link for sending comments to the White House.