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In page Composite armour:

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Among NATO nations and allies, the most common type of composite armour today is Chobham armour,[citation needed] first developed and used by the British in the experimental FV 4211 tank, which was based on Chieftain tank components. Chobham uses multiple non-explosive reactive armour plates (NERA), which sandwich a layer of elastomer (like rubber) between two plates of steel armour. This was shown to dramatically increase the resistance to HEAT projectiles, even in comparison to other composite armour designs. Chobham was such an improvement that it was soon used on the new U.S. M1 Abrams main battle tank (MBT) as well. The need to mount multiple angled plates, along with an outer steel layer to protect the armour array, gives the Challenger and Abrams their "slab sided" look.