Firewall and Security system

Firewall noun - (computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet.

Security system and firewall are semantically related. In some cases you can use "Security system" instead a noun "Firewall".

Security system noun - An electrical device that sets off an alarm when someone tries to break in.

Firewall and security system are semantically related. Sometimes you can replace term "Firewall" with "Security system", this terms are similar.