ROM

ROM (Read-Only Memory) is a type of non-volatile memory used in computers and other electronic devices. It is often used to store boot up instructions, operating system code, and application programs. ROM is not directly accessible by the user and can only be written to by the device manufacturer.

ROM is used in embedded systems such as programmable logic controllers (PLCs), industrial controllers, and automotive systems. It is also used in game consoles, prototyping systems, and home computers.

ROM is usually a combination of erasable programmable read-only memory (EPROM) and electrically erasable programmable read-only memory (EEPROM). EPROMs can be written to with special programming devices. EEPROMs can be written to with standard electrical signals.

Both types of ROM are very reliable and can store data for long periods of time. Additionally, this type of memory is relatively inexpensive.

In the context of computer security, ROM is often used to store trusted boot code. This code is used to verify that the system hasn’t been tampered with before it can boot. In this way, ROM provides a layer of security against malicious actors.

Overall, ROM is an essential part of computers, programming, and cybersecurity. It provides a reliable, inexpensive form of non-volatile memory for data storage and trusted boot code.