These are complex mathematical formulas with which search engines perform most of their main tasks. For example, make up a search extradition, relevant specified by user on request. They work on the principle of a “black box” containing a set of predetermined parameters, at the entrance to which the problem “placed”, and at the output “policy” the found solutions are “selected”.

You can also determine search algorithms for search algorithms filters, that monitor quality web resources, located in index PS, and “honesty” of ways to promote them (“Panda"," Hummingbird ","Penguin").