Search engines have two major functions: crawling and building an index, and providing search users with a ranked list of the websites they've determined are the most relevant.Search engines are answer machines. When a person performs an online search, the search engine scours its corpus of billions of documents and does two things: first, it returns only those results that are relevant or useful to the searcher's query; second, it ranks those results according to the popularity of the websites serving the information. It is both relevance and popularity that the process of SEO is meant to influence.To a search engine, relevance means more than finding a page with the right words. In the early days of the web, search engines didn’t go much further than this simplistic step, and search results were of limited value. Over the years, smart engineers have devised better ways to match results to searchers’ queries. Today, hundreds of factors influence relevance, and we’ll discuss the most important of these in this guide. Search engines typically assume that the more popular a site, page, or document, the more valuable the information it contains must be. This assumption has proven fairly successful in terms of user satisfaction with search results. Popularity and relevance aren’t determined manually. Instead, the engines employ mathematical equations (algorithms) to sort the wheat from the chaff (relevance), and then to rank the wheat in order of quality (popularity). These algorithms often comprise hundreds of variables. In the search marketing field, we refer to them as “ranking factors.” Moz crafted a resource specifically on this subject: Search Engine Ranking Factors.In addition to this freely-given advice, over the 15+ years that web search has existed, search marketers have found methods to extract information about how the search engines rank pages. SEOs and marketers use that data to help their sites and their clients achieve better positioning.

2. How people intract with search engine

One of the most important elements to building an online marketing strategy around SEO is empathy for your audience. Once you grasp what your target market is looking for, you can more effectively reach and keep those users.Why should you invest time, effort, and resources on SEO? When looking at the broad picture of search engine usage, fascinating data is available from several studies. We've extracted those that are recent, relevant, and valuable, not only for understanding how users search, but to help present a compelling argument about the power of SEO."For marketers, the Internet as a whole, and search in particular, are among the most important ways to reach consumers and build a business.All of this impressive research data leads us to important conclusions about web search and marketing through search engines. In particular, we're able to make the following statements: Search is very, very popular. Growing strong at nearly 20% a year, it reaches nearly every online American, and billions of people around the world. Search drives an incredible amount of both online and offline economic activity. Higher rankings in the first few results are critical to visibility. Being listed at the top of the results not only provides the greatest amount of traffic, but also instills trust in consumers as to the worthiness and relative importance of the company or website.Learning the foundations of SEO is a vital step in achieving these goals.

3. Why search engine markting is necessary

An important aspect of SEO is making your website easy for both users and search engine robots to understand. Although search engines have become increasingly sophisticated, they still can't see and understand a web page the same way a human can. SEO helps the engines figure out what each page is about, and how it may be useful for users.