ZoneAlarm is a personal firewall software application originally developed by Zone Labs, which was acquired in March 2004 by Check Point. It includes an inbound intrusion detection system, as well as the ability to control which programs can create outbound connections. As of June 2011, the newest release is ZoneAlarm Extreme Security 2012. ZoneAlarm was formerly known as Zone Labs.
In ZoneAlarm, program access is controlled by way of "zones", into which all network connections are divided. The "trusted zone" generally includes the user's local area network and can share resources such as files and printers, while the "Internet zone" includes everything not in the trusted zone. The user can specify which "permissions" (trusted zone client, trusted zone server, Internet zone client, Internet zone server) to give to a program before it attempts to access the Internet (e.g. before running it for the first time) or, alternatively, ZoneAlarm will ask the user to give the program permission on its first access attempt.