What Wi-Fi card do I have?

I have Lenovo G580 model number 20157

In device manager > network adapters it says Broadcom 802.11n Network Adapter,

Is that it?
How do I find updates for it from Broadcom? Anyone got link?

You did not say what OS you are running (which Windows version) or why you think you need a driver update (is something not working properly?).

My Lenovo all-in-one at work came with a Lenovo app that I suspect should keep drivers up to date (it did a BIOS update).