Endurance refers to the finite, expected lifespan of the SSD.
Every SSD has a limited number of program/erase (P/E) cycles that it can endure.
This number is influenced by certain conditions, such as the data retention period the NAND is designed for, the operating temperature, the storage temperature, etc.
Because typical PC usage patterns are often less demanding than those in the lab and because SSD wear leveling techniques continue to advance, SSDs may last much longer than users expect or even than the manufacturer’s warranty period.