Basic question in C#, Generic section.

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Hi guys, I am learning C# write now and*at*the chapter of Generics, So far I know this:-

 

example:-

 

public*class Circle*

{

***.....

}*

 

The between the*angle brackets*specifys the type of the instance of the class*Circle it*will be by*default*(other than the object class) by which it will be treated like (ex. int, char or any class that is specified). My question is in here:-

 

*public*class Circle where T*

{

***.....

}*

 

What is ment by where T*here? and*by what it*is saying*why do I need it as long as I specify the ? is it usefull for something else? Interfaces or abstract classes*for example?

 

And thank you in advace.

 

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