baseballfan wrote
A Chess engine is a program that will play chess. It is a program that will "think" and decide on chess moves to make. You can read about them here: http://en.wikipedia.org/wiki/Chess_engine .
Please note, it is illegal to use engines during an ongoing chess.com game. The real advantage for them is to use after your game to maybe help you reaize where you went wrong, and how you might be able to play better.
http://www.chess.com/forum/view/general/what-is-a-chess-quotenginequot-and-what-does-it-do-for-me
Is it proper to use chess engine for online games?? I mean on online games you get plenty of time to do research, if a person takes the help of a computer to solve a position than i think it is unfair. It will be like playing human vs computer, or who knows computer vs computer if both player are using chess engine.