If you have played 8 ball pool offline in a pool hall or bar, you will know what this is, only it is on computer and comes in 2 versions: 2d and 3d. There are a few differences between the two online versions. Sometimes a shot that looks easy online will be totally different at the pool hall or bar, as in very difficult in the real world. Other times, the reverse can be true. The most realistic online 8 ball multiplayer pool game online is a 3d one where you dont meet up with so easy looking shots as you would encounter as in a 2d one.
If you are younger and cannot go into a bar to play pool games in the real world, online pool games is the greatest thing for you to practice on until you age up where you are allowed to go into a bar to play. This way you will have your skills sharpened and able to take on older people who have been around for a challenge. They will think that you are a hot shot at 8 ball pool games at the bar when you then go there.
Also if you are too young to hold a decent enough job to actually buy a billiards table and the needed cues and so forth to go with this, online 8 ball multiplayer pool games would be great for this situation. Space in the home may be another reason that you wouldnt have a billiards table. Also the cost of that altogether may be additional reasons. Depending on what your reason, or set of reasons are, you can play online pool games on your computer without having to invest money on much, except just keeping your computer that you already have.