SEO (Search Engine Optimization) is a service that helps to improve the visibility of a website or web page in a search engine’s unpaid results—often referred to as “natural”, “organic”, or “earned” results. SEO services can include on-page optimization, link building, content optimization, keyword research, and more. SEO services are used to ensure that a website is visible to the right people and that it can be found through popular search engines like Google, Bing, and Yahoo.