This document provides an overview of search engine optimization (SEO) in 3 sentences or less. SEO is the process of getting traffic from organic or natural search engine results by optimizing websites and content for relevant keywords. The document lists many SEO techniques including on-page elements like titles, descriptions and keywords; technical aspects like site structure, redirects and sitemaps; and off-page factors like link building, social media and local search. The goal of SEO is to increase the prominence and visibility of websites in search engine results pages.