What is the program "Additional Drivers" (jockey-gtk) talking me about?

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http://askubuntu.com – The program says: "No proprietary drivers are in use on this system" But it doesn't say if it is talking about graphical drivers only or what. Then, it lists two drivers: NVIDIA accelerated graphics driver (version 173). NVIDIA accelerated graphics driver (version current) [recomended] Both have exactly the same description. What is the difference between them, then??. Moreover, When I select the 1st one, it says: "This driver is not activated",and there's a button to "activate" it. When I select the 2nd one, it says: "This driver is activated but it is not currently in use", and the (HowTos)