SERPS is an acronym for Search Engine Results Pages. A Search Engine Results Page is a webpage containing a list of websites provided by a search engine in response to a users search request.
When a user makes a search request for a particular word or phrase, the website that is displayed first in the list is said to have a number 1 SERPS position for that particular word or phrase.
Getting your website high in the SERPS is the main purpose of Search Engine Optimisation. Most of your website visitors are likely to use search engines to find your website, so getting a high placement with the SERPS for relevant Keywords is essential.