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gravity is probably one of the more simple natural occurring phenomena to grasp easily than every other physics problem which has drastically shifted focus to QM and string theories. It's the curvature of spacetime as a consequence of mass; mass tells spacetime how to curve, spacetime tells mass how to move. The greater the mass, the greater the curve. It's value has been measured precisely via the Cavendish experiment as 6.674×10?11m3?kg?1?s?2 so it's quite weak and therefore incompatible with quantum physics so only can be measured on very large scales with very large objects. Read more on Newton's law of universal gravitation.
