A Search Engine is a computer program which retrieves information from a variety of sources and makes it easier to search. The most common use of Search Engines is searching the internet for information.
Most Search Engines store a massive amount of information to make indexing and retrieval faster.
These search engines are the largest, and typically offer specialized searches in specific languages. (Using the appropriate Top-Level Domain Suffix.)
These sites group search engine results pages (SERPS) from multiple engines: