What is this editors ?

[WorldClassic]

This user has been denied support.

As the title says what is this editors . I am new on myBB . i have found many plugins named as Editors Like :
1.MyBB Editor CKEditor (Not Html) 
2.[For 1.8] Rin Editor 0.6.19 (Powerd by CKEditor) 

And Others too .  I need to know what it does and what is its work ?

[WallBB]

Hey WorldClassic,
These are just replacement for default MyBB editor if you want to use.
They have some extra features which you can read from their descriptions.