In this case the <> signs are used not to mean less than or greater than, but they are a syntax used with generic methods to supply a specific type to be used by the method.
[Here's the MSDN page on generic methods][1]
Basically the AddComponent method doesn't define what component should be added, so you are supplying the type you want using this syntax.
[1]: http://msdn.microsoft.com/en-GB/library/twcad0zb.aspx
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