what is the use of security slot in MacBook Pro

Buy Lenovo Security Cable, Kensington Security Slot Lock kensington security slot If we choose to use mounting AP-220-MNT-W2 , will it block the kensington security slot at ap 215 ? kensington security slot Kensington ClickSafe K64640 Twin Laptop Cable Lock - Master - Keyed Lock - Item #241123

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