What does boxing mean?

I want to know about boxing, what does boxing mean?

 

In very crude terms it is casting to an object

http://msdn.microsoft.com/en-us/library/yz2be5wk(v=vs.80).aspx

 

It is the process of switching a value type to the type object or to any interface type executed by this value type.

For example,

int i = 789;
// following line boxes i.
object obj = i;

 

Hi,

When a value type is converted to object type, it is called boxing

object obj;
obj = 100; // this is boxing

Thanks