Abstract
Search engine is a computer program that searches documents on the internet containing terms being searched by a user. This study discusses the search engines, an effective tool for library professionals. The study determines the various aspects of search engine including background of search engines, and how search engines work. Further, it analyses the internet search techniques, i.e., basic, advanced and refine search. The paper highlights the effective use in searching information on internet on the basis of Boolean operators AND, OR, NOT and proximity searching, etc. Finally, it highlights the categories of search engines.