Ranking is a term related to search engines. When someone searches for something using a search engine, they will receive pages and pages of results. Where a specific site appears in those results is its ranking. Closer to the top means it has a higher ranking. A critical consideration in having your website found on the internet.

There is a second meaning as well, more commonly used with regard to marketing and SEO and related specifically to Google. Each page of a website is given a ranking by Google, from 1-10. This ranking is the value that Google places on that particular page in relation to its subject matter and how relevant it is. The more relevant a page is believed to be the higher its ranking