Program Restricting External Access to a Computer
Puzzle 15 of Bits and Bytes Pack
Question is: Program Restricting External Access to a Computer
and the answer is: FIREWALL
Word Meaning:
FIREWALL — (architecture) A fireproof barrier used to prevent the spread of fire between or through buildings, structures, electrical substation transformers, or within an aircraft or vehicle.
Definition source: Wiktionary (CC BY-SA 4.0)