What type of malicious software encrypts a victim's files and demands payment for decryption?

From the computer world: What does the word "modem" abbreviate?

Who founded the Free Software Foundation in 1985?

What does the acronym VPN stand for?

What company is the largest producer of computer software for the personal computer?

What early programming language was developed by John Backus at IBM in the 1950s for scientific computing?