Electronically Erasable Programmable Read Only Memory (EEPROM)
WARNING: This page is about a different car, the 2020 Ford F-550 Super Duty, 2020 Ford F-450 Super Duty, 2020 Ford F-350 Super Duty, 2020 Ford F-250 Super Duty, and 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The PCM stores information in the EEPROM (a memory integrated circuit chip) about vehicle operating conditions, and then uses this information to compensate for component variability.