What does the ball compression of a golf ball mean?

I bought a box of Taylor Made burner tp golf balls and on the side it says it has a 75 ball compression could someone explain what that means and if they are good for me- I have a slower swing speed.

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what are the pros and cons of a low compression golf ball?

I bought the slazenger distance feel and believe they are low compression
if not,tell me, but what are the pros and cons of a low and or high compression golf ball?

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