This document provides an overview of search engine optimization (SEO) techniques. It discusses how search engines work by crawling websites, indexing pages, and ranking them in algorithms. It describes what factors search engines like Google consider in rankings like keywords, links, titles, and meta tags. The document outlines both on-page and off-page optimization strategies and tools. It notes that SEO is time-consuming but can help websites rank higher organically and get more visitors through free traffic from search results.