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Pop-up -: Pop-up used to describe a Window that appears on top of all other Windows. This term became a well-known term with the advent of intrusive and non-intrusive Internet pop-up ads.
These ads became increasingly annoying as this form of advertising started to become more popular with many web pages.
Search engine -: A search engine is a software program or script available through the Internet that searches documents and files for keywords and returns the results of any files containing those keywords.
Today, there are thousands of different search engines available on the Internet, each with their own abilities and features.
The first search engine ever developed is considered Archie, which was used to search for FTP files and the first text-based search engine is considered Veronica. Today, the most popular and well known search engine is Google