ZoneAlarm was developed by Zone Labs, whose CEOs were Kevin Nickel, Mouad Abid and Shahin and the Company was acquired in March 2004 by Check Point.

[2] ZoneAlarm's firewall security products include an inbound intrusion detection system, as well as the ability to control which programs can open outbound connections.

The "trusted zone" which generally includes the user's local area network can share resources such as files and printers.

[3] "True Vector Internet Monitor", also known as "TrueVector Security Engine", is a Windows service that is the core of ZoneAlarm.

On September 2, 2010, the free version of ZoneAlarm started showing a "Global Virus Alert" popup as a scareware tactic to get users to switch to their paid security suite.