it is to acquire several information about the process you control and to generate the suitable reaction for these information to the process itself.
labview is a unique tool, it uses the G-language in programming (graphical language), it consists of two screens :the user interface, and the programming screen.
in user interface you'll see switches,leds,graphs.. etc. while in programming screen you'll be able to use the basic if..then..else..,for...next,while...wend.
so if you know the c++ or any programming language you can easily learn it.
labview is used for data acquisition and to make reports about plants or processes it is a powerful tool for servo control and plc control, and so its industrial version (BRIDGEVIEW).
i have used labview in my graduation project, we made an optimal digital PID controller for a temperature control sysetm.