What are the 4 types of rom?

Great question! Here's a simpler way to understand the ROM evolution: Mask ROM - "Printed" at factory (like a book printed and bound) PROM - "Write-once" by user (like burning a CD-R) EPROM - "Reusable but inconvenient" (needs UV light to erase - that little window on old chips) EEPROM - "Conveniently rewritable" (like a whiteboard you can erase and rewrite easily)Your computer's BIOS/UEFI was traditionally stored on EEPROM, which is why you can update it without replacing physical chips. Flash memory (in USB drives, SSDs) is actually a type of EEPROM but with different internal architecture for higher density and speed.

The four main types of ROM (Read-Only Memory) are:1. Mask ROM - Factory programmed, cannot be modified. Used in mass production.2. PROM (Programmable ROM) - Can be programmed once by user using special equipment.3. EPROM (Erasable Programmable ROM) - Can be erased with UV light and reprogrammed.4. EEPROM (Electrically Erasable Programmable ROM) - Can be erased and reprogrammed electrically while in circuit.Most modern devices use EEPROM or its derivative, Flash Memory, which allows for easy updates (like your phone's firmware). Each type represents an evolution in flexibility and rewritability while maintaining non-volatility (data persists without power).