Search Engines are one of the most important way of getting traffic to your website, So to get a good traffic to your website it is very important to know about the how search engine work, There are  three things on which your website get index in the search engines, one is Spider, Crawler, indexer.

Robots in the Search Engine are known as the Spider, the main work of the spider is to check the newly/ updated links in your website, As you update the website the spider check the link in the website and then comes the crawler it’s work is to crawl all the newly/updated pages in your website and take that page to it’s cache momory, when all your page get crawl and get into the memory then, It’s time to get index that page in the Search Engine, Indexer find keyword, backlink, title tag, description tag in your web page and arrange cache pages according to the algorithm in the search engine.

Study of that Alogorithms to make your website to the top of search engine is know as seo ( Search Engine Optimization). To Read more about Algorithms read next article.