Update index.html.md

source/glossary/index.html.md

@@ -46,7 +46,9 @@ A group of companies that develops software products for developers and project
 ### Auto Defined User Group
-*** Needs definition here
+User groups are a way of centralizing control over important management tasks, particularly access control and password policies. 
+A simple example of such groups are the users and the admins groups.
+In most of the cases these groups are auto defined in terms of access, rules of usage, conditions to be part of, etc...
 ### Bamboo