GreyLog and netflow

Hi guys , Im learning about GL.
I saw under system/inputs that it is possible to create a netflow udp input.
Could you briefly explain what can I do with this ?
Currently im using nfsen to see netlfow info, does GL provides similar interface ?
Can GL provide tools for failure detection / security attacks / others using netflow data ?
Do i need to get lisence to try these feature ?
Any tuto/doc for further reading would be great.

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