What does the keyword Set actually do in VBA?

Question

Hopefully an easy question, but I\'d quite like a technical answer to this!

What\'s the difference between:

i = 4

and

Answer 1

From MSDN:

Set Keyword: In VBA, the Set keyword is necessary to distinguish between assignment of an object and assignment of the default property of the object. Since default properties are not supported in Visual Basic .NET, the Set keyword is not needed and is no longer supported.