How googles search engine works

Hi! Welcome to the CCSC podcast. Today I am going to tell you how Google's search engine works, as simple as possible. The first thing you should know is that when you search Google your not actually searching the web, your searching Google's index of the web. Googles index of the web is made up of over 60 million individual pages. Also Googles index consist of over 100 million gigabytes of data! Google use software known as “web crawlers” to discover available pages. They go from link to link and bring data from those web pages back to the Google index. The site owners choose whether there sites are able to be crawled. Computer programs determine which sites to crawl, how often and how many pages to fetch from each site. Google uses algorithms. Algorithms are a set of instructions. Google’s algorithm takes your questions you type in Google and turn them into answers by using formulas. They look for clues and give you the most sufficient web pages you want. Based on these clues, the algorithms pull out web pages from the index. The algorithms then rank the results into importance order. They also have a safe search check, to insure you are not getting the adult only content on your computer. Also Google uses signals to determine how trust worthy a source is. One of these signals is PageRank(one of Googles first algorithms, which looks at pages to determine there relevance, according to what you have searched). Each search happens in one eighth of a second! Furthmore Googles index is refreshing constantly to update it. In addition, Google uses your location, otherwise known as geographical region, and web history to find relevant pages. It also looks at your region to find pages with the correct language.

That’s how a search engine works