NetFlow is a network protocol developed by Cisco for collecting IP traffic information and monitoring network traffic. By analyzing flow data, a picture of network traffic flow and volume can be built. Using a NetFlow collector and analyzer, you can see where network traffic is coming from and going to and how much traffic is being generated.
Experience for yourself how a software-based NetFlow collector and analyzer works by downloading a free trial of SolarWinds NetFlow Traffic Analyzer.
SolarWinds NetFlow Traffic Analyzer (NTA) is an example of a software-based NetFlow collector that collects traffic data, correlates it into a useable format, and then presents it to the user in a web-based interface.