Oh! Yes, okay. When you write <a href=site.tld/path title="What the Page is really Called">some other text which does not match the page title but you feel like linking with anyway</a>, the title attribute is the part that's "What the Page is really Called."

I don't know precisely what screenreaders or other accessible devices do with that information, but I know it's helpful.

Also, to back up a bit, in HTML, the tag is when you're marking up a document and saying "This bit of info I've surrounded with a tag is this sort of thing," so like <b> is the bold tag and <p> is the paragraph tag. <a> is the anchor tag. If the tag has to be modified in some way, you indicate that with an attribute. The most common attribute with the anchor tag is the href, which tells you "this text being surrounded by the anchor tag should be a link to stuff here." What the title attribute tells you is "The thing that I am linking to is actually called this." So, say, in Firefox, the title is often shown as a tooltip. And if you have a tool that's parsing the HTML document for links, instead of grabbing the link and calling it "You gotta see this!" (the stuff surrounded by the anchor) it can call it "Rickrolled, suckas!" if someone has given the link the title of "Rickrolled, suckas!"