i see so many topics about it what is it ?

http://en.wikipedia.org/wiki/Collision_detection

Basically if things "bump" into each other or pass right on through each other.

Seriously?

Okay, Collision Detection is the games ability to detect when you bump into something whether it be terrain, another character, or scenary as well as detecting when a sword strikes someone as an example.

ESO doesn't have collision destection with regards to character interaction, so players will not be solid and won't be able to block someone. (All other CD is present) The main argument here is that ESO desperately needs CD in order to be succesful (It doesn't, the games success will be determined by something other than someones ability to block a doorway)

Now that the question has been answered, use this thread to discuss the aspect.

http://www.gamesas.com/topic/1475405-collision-detection-between-player-characters/

However, it is a moot point, as something like this has to be designed into the game on Day 1, it can not be added or removed at this stage of the game development.