Security software is a broad term that encompasses a suite of different types of software that deliver data and computer and network security in various forms. Security software can protect a computer from viruses, malware, unauthorized users and other security exploits originating from the Internet. Types of security software include anti-virus software, firewall software, network security software, Internet security software, malware/spamware removal and protection software, cryptographic software, and more.

In end-user computing environments, anti-virus and anti-spam software is the most common type of software used, whereas enterprise users add a firewall and intrusion detection system on top of it.