What are the Search Engines?A Search Engine is special database-driven web site designed to index and categorize internet addresses. Search Engines focus to help people to find information stored on the Web.There are four basic types of Search Engines: Crawler-based (automatic), Human-powered Directories, Meta and PPC (Pay-Per-Click).Although most of the Search Engines that operates today shall be classified as Hybrid Search Engines because it has become extremely common for two or three types o.