Crawler-based Search Engines
They’re search engines like google that may automatically list your internet site, with the perfect example being Google. Using this kind of search engine with real privacy, if the site changes your listing changes. There are 3 parts towards the way the major search engines work and these are:

1. The Spider – also knows and the crawler or robot. The spider will travel around the web reading webpages and also the code which makes them up and in addition follow and links along with other web pages. After a site may be visited by way of a spider it is stated that the site may be “spidered” or “crawled”. On a monthly basis the spider will revisit all old sites and discover any a new one with the links from these sites. All the outcomes of its work are kept in:
2. The Index – this can be a database which has a duplicate of each and every website that has been spidered. In case a web site changes then your database is going to be updated. There is often a delay between your site being spidered and indexed. In case a site is not indexed then it will not be seen with a user of the internet search engine. Looking results which can be found by an individual of the search engines like google are brought out by:
3. The application – this can go into the database and rank every one of the sites so as of relevance for every search phrase. This rank depends on the guidelines that are setup for that particular internet search engine and will also be different for each and every one.
Human-Powered Search engines like google
They’re also called directories and sites has to be submitted from the owner so they can get listed. There are many types and some are free and some are paid. All entries should be reviewed from the editor and approved before they are submitted. All searches with the site are carried out with the text in the title as well as the description provided to the website. In case your site changes then your listing won’t change.
Hybrid Search engines like google
They are a mix of both crawler-based and human-powered engines like google. Many of these will have a bias to either submitted sites or crawled sites and so you may find that submitted sites appear higher inside the search engine results even if they may be less relevant.
Conclusion
Even though 2 different search engines have indexed every one of the same sites then a results that visitors see could be different for a way each engine’s software ranks the sites. To be able to rank highly in as many search engines as you can it is important to learn as much about their rules to ranking as possible and do the necessary things to your site.