Railway Science (Computer – Memory)

A floppy disk is a magnetic storage medium for computer systems.

A programmable read -only memory (PROM) is a form of digital memory where the setting of each bit is locked by a fuse or anti-fuse.

Secondary storage, sometimes termed auxiliary storage, refers to the storage of data that is not accessed frequently as the data in primary storage.

Read-only memory (ROM), also known as firmware, is an integrated circuit programmed with specific data when it is manufactured. A semiconductor is a substance that has specific electrical properties that enable it to serve as a foundation for computers and other electronic devices.
Photoelectric cell is an electronic device which converts light energy into electrical energy. It is also called an electric eye or photo tube. Magnetic tape is the low-cost average for storage because it can save a huge number of binary digits, bytes, or frames on each inch of the tape.

Wi-Fi (wireless -fidelity) - A wireless networking technology that uses radio waves to provide high-speed Internet access. POP (post office protocol) - It is the most commonly used message request protocol in the Internet world for transferring messages from an e-mail server to an email client.
Modem - A modem is a network device that both modulates and demodulates analog carrier signals (called sine waves) for encoding and decoding digital information for processing .