Like the poker card game, most online games are played strictly for fun. Games like Solitaire, Spades, Hearts, Bridge--and many others--are extremely popular and serve as meeting places for internet friends and other long-distance friends. Poker-style games exist, too, but most are simply for fun and friendly competition rather than high stakes.

Internet card games are designed both for single-player  and multi-player games. Sometimes  Hearts, can be played solo but there is usually a game that you can join in on with other players. Then you can chat back and forth and make friends while you entertain yourself and sharpen your skills.

For solo play, Solitaire or variations on 21 are in great abundance. Solitaire is actually a category of games, so you will probably find variations you never knew existed. Often these games are played against the clock and a combination of speed and bonus scoring determines your final score--and bragging rights in the chat room.

Many online games sites have online card games tournaments where entrants can pit their skills against all the other players. These tournaments are usually just for fun, though you may be able to win a prize by placing well. Most of the time, they are about friendly competition rather than taking someone else's money.