Conferred by FIDE, it is the highest title (aside
from World Champion) that one can achieve. It is awarded
to players who meet established performance standards.
Other titles (in order of importance) are International
Master and FIDE Master. Once earned, these titles
cannot be taken away.
A FIDE title awarded to the top players in the
world. Grandmaster's usually must achieve a FIDE rating
of 2500 or more.
The title International Grandmaster is awarded
to world-class chess masters by the world chess organization
FIDE. It is a lifetime title, in chess literature
usually abbreviated as GM or IGM (this is in contrast
to WGM for Woman Grandmaster and IM for International
Master. Woman Grandmaster, it should be noted, is
a misnomer. It is awarded for a level of skill roughly
equivalent to that of an FM, or FIDE Master, a lower
title than International Master.)