Another great advantage is that the one line that you choose to describe that page is what people see in the Google search results. For example below is a search result done for this website.
So, what can you do to fix it? Make sure each page of your website has a page description. Where you find access to this of course depends on the kind of website you have. Most often it is under settings or options. Look for a description for the website if you are on a blog. If you have a website with multiple pages look for a page description under settings, options or search engine optimization. You can also put it directly in the code.