What is keyword ranking?
Keyword rankings are your web page's position in search results (from Google, Bing or other search engines) for a particular keyword search query. In other words, it’s your google rank, the spot your URL has on the search engine when someone enters a particular keyword is your keyword ranking (1st, 10th, 256th).
You can track keyword rankings as a list of all the best keywords you rank for on Google for example to have a good idea of what pages and keywords worked best.