Search Engine Optimization Definitions And Explanations

What is Search Engine ?

 A Search engine is one of the most important tools that help you to find information on the web. Although search engine is really a general class of programs, the term is often used to specifically describe systems like Google, Yahoo, Bing etc.The utility of Search Engines in web search lies in the fact that they are responsible for retrieving large amounts of information very easily using certain keywords. Potential customers will enter ’keywords’ in a Search Engine and perform a search.

Search engines are huge databases, which use their own internal algorithms to decide which web pages to display when someone enters a keyword or key phrase. The idea is to produce the most relevant results, from up to 300,000,000 records. For the reason of sheer size, the indexing of these records has to be computed automatically, and the most relevant results returned to your browser. To complicate matters, each search
engine has its own unique algorithm, and sometimes they use each other's listings (and a variation of those algorithms) as well.

These are the Oldest Search engines
ALIWEB - The Web's Oldest Search Engine - Est. 1993.
Lycos - launched in 1994.
Search engines index the websites on the World Wide Web and store thousands of web pages in their database.
They present a list of web sites based on the words, known as “keywords”, typed in by the user. The higher your Web Site is on this list, the greater chance somebody will visit it.

How Search Engines Work

The first basic truth you need to know to learn SEO is that search engines are not humans. While this might be obvious for everybody, the differences between how humans and search engines view web pages aren't. Unlike humans, search engines are text-driven. Although technology advances rapidly, search engines are far from intelligent creatures that can feel the beauty of a cool design or enjoy the sounds and movement in movies. Instead, search engines crawl the Web, looking at particular site items (mainly text) to get an idea what a site is about. This brief explanation is not the most precise because as we will see next, search engines perform several activities in order to deliver search results – crawling, indexing, processing, calculating relevancy, and retrieving.

First, search engines crawl the Web to see what is there. This task is performed by a piece of software, called a crawler or a spider (or Googlebot, as is the case with Google). Spiders follow links from one page to another and index everything they find on their way. Having in mind the number of pages on the Web (over 20 billion), it is impossible for a spider to visit a site daily just to see if a new page has appeared or if an existing page has been modified, sometimes crawlers may not end up visiting your site for a month or two.

What is Search Engine Optimisation (SEO)?

Search engine optimization (SEO) is the process of improving the visibility of a website or a web page in search engines.Seo may target different kinds of search, including Content serach image search, video search.

As an Internet marketing strategy, SEO considers how search engines work, what people search for, the actual search terms typed into search engines and which search engines are preferred by their targeted audience.