Computer and network surveillance refers to monitoring computer activities performed by organizations, governments, or individuals.
This further extends to keeping an eye on data stored on hard drives, as well as data constantly transferred over computer networks.
Surveillance can be done in a number of ways, yet as of late, this mostly takes place automatically and remotely.
For example, in the US, all phone calls, emails, instant messaging, etc. are available for real-time monitoring by Federal law enforcement agencies.
Some noteworthy benefits of computer and network surveillance include fraud detection and the prevention of illegal activities.