What are the three primary components of NetFlow?

NetFlow includes three key components that perform the following capabilities:
• Flow caching analyzes and collects IP data flows entering router or switch interfaces and
prepares data for export. It enables the accumulation of data on flows with unique characteristics,
such as IP addresses, application, and CoS.
• FlowCollector and Data Analysis captures exported data from multiple routers and filters and
aggregates the data according to customer policies, and then stores this summarized or
aggregated data. Users can leverage Cisco NetFlow collector as a flow collector, or they can opt
for a variety of third-party partner products. A Graphical user interface displays and analyzes
NetFlow data collected from FlowCollector files. This allows users to complete near-real-time visualization or trending analysis of recorded and aggregated flow data. Users can specify the
router and aggregation scheme and desired time interval.
Reference. http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/iosnetflow/product_data_sheet0900aecd80173f71.html