Internet Chess Server Clients are specialized chess programs you load on your computer for enhanced access to sites that support them, like ICC, FICS, chess.net and VOG. Most Web chess sites do not require specialized chess software. For these, just click on the link here to Games: Internet: Web: Board Games: Chess: Servers. Generally, playing chess with in Internet Chess Server Client program provides better speed and features that simply playing with your browser, but has a longer learning curve.
More information