Many of the popular online card rooms today give you the opportunity to play Texas Holdem Tournaments for free:
1) Freerolls and 2) Play Money tournaments, where you can play big field multi-table tournaments (MTT's) down to a small 6-handed Sit-n-Go table.
A "free roll" tournament is a regular poker tournament with a $ 0.00 buy-in, so the name "freerolls". The nice thing is they still pay out "real money!" Through every day, online card rooms have freeroll tournaments scheduled, and often times have promotional freeroll Sit-n-Go's every 5-10 minutes.
Freerolls are a great way for people to establish and build a "real money" bankroll without any real money deposit. It may take a while to cash-in, as many freeroll tournaments are huge, some going up to 30,000 players in one tournament. But it's free, fun, fills your poker crave, gives you a great way to learn and improve your game. Plus you will ever get "in-the-money" (ITM) as you become a better tournament player. When you cash-in at your first freeroll tournament, you'll feel like you just won the WSOP (lol)!
The other option you have is to play in "Play Money" games. Similar to the freeroll schedule, there are always tournaments and Sit-n-Go games ready for Play Money. This is a great way to play as much poker as you want, whenever you want, for FREE!
At the same time, you've got a "play chip" bankroll to manage and try to build up. While real money is not at stake, you will still have a great poker experience on the Play Money tables. It's great for beginner's to learn the basics of Texas Hold 'Em and basic poker strategy. Even for more experienced poker players, Play Money is a nice way to test out different strategies in their game without risking any real money.
WHERE TO PLAY
The big and more popular online poker sites are: Full Tilt Poker (fulltiltpoker.com), PokerStars (pokerstars.com) and Cake Poker (cakepoker.com). I personally play at Full Tilt Poker because many of my favorite professional poker players not only endorse the site, but they play there too. The software is excellent, the user interface is beautiful and they are constantly making improvements to their play and technology.
To start playing online , simply sign-up at one of the online card rooms, install their free software application, and you'll be in a free tournament in no time. Good luck and have fun! See you on the virtual felt of online poker.