Help....what is codec?

[DAVE.]

there are some toni kessering clips here but you need a codec.what is this?for windows media player.

http://www.geocities.com/dobrak2000/Toni_1.htm

[joe king]

compression decompression
download here
http://www.divx.com/

[DAVE.]

cheers mate....i'll give it a go.