There is nothing special in the free casino games that are found in the countless gambling portals. They are just simulations of the games that one plays in the real casino. Most of them have excellent graphics and sound effects too.
The main advantage the player has is they can play these free casino games from the relative comfort of the home. If one looks at it, even the paid online games do not require you to go to any special location and you can play them from home too. Having a bit of knowledge about the games you are about to play does help a lot in the long run.
Most people do not want to risk their money in betting in the online casinos. They would rather prefer to know a bit about the games before they commit their money on the same. The free casino games provide them with such an opportunity. To know the games thoroughly before they decide to play the same investing their cash. Once they are confident and learn the games they will play the paid versions and leave the free casino games for newcomers.