What are the differences between "absolute maximum ratings" and "recommended operating conditions"?

Absolute Maximum Ratings: The rated values that must not be exceeded even one moment to maintain the life and reliability of the product.
Recommended Operating Conditions: These are rules to ensure proper operation. These conditions must be absolutely followed.

If any one of the recommended operating conditions is exceeded, operation of the IC cannot be guaranteed. Take a measure to use within the rated values or select other appropriate ICs.