The meta-title is a fancy name for the text that is used to describe your page in search. For instance, if you search for your restaurant's name, it's the text that makes up the link to your search result. Your meta-title is also the text that appears on the tabs in your web browser.

Since how you change your meta-title depends on what platform your website is built on, you'll want to do a quick google search to find out how to change it. Make sure to include the name of your platform in your search.