Here's why:

* Erasable: EPROMs can be erased by exposing them to ultraviolet (UV) light. This allows you to reprogram them multiple times.

* Programmable: EPROMs are programmed using a special device called a programmer.

* Read-Only: Once programmed, they function as read-only memory, meaning you can only read the data stored on them.

Important Notes:

* Removed from circuit: It's crucial to remove the EPROM from the circuit before exposing it to UV light. This is because UV light can damage other components on the circuit board.

* Erasure Time: Erasing an EPROM can take a significant amount of time, often several minutes or even longer, depending on the chip and UV exposure.

* Replaced by Flash Memory: EPROMs have largely been replaced by flash memory, which offers faster programming speeds, greater write endurance, and doesn't require UV light for erasure.

Let me know if you have any other questions about EPROMs or memory technologies!