WPS is a wireless networking standard that was created in an attempt to make connections between routers and wireless devices easier. Normally you wouldn't be able to connect to a wireless network without the network name (SSID) and its password (WPA2-PSK key). This is where WPS would come in. To connect using WPS both your wireless router and your wireless client device must support WPS. There are several ways you can connect to a wireless network using WPS.
While at first glance it seems easier to use WPS and connect to the wireless network right away, it introduces several security risks. A major security flaw was revealed in December 2011 that affects all manufacturer's wireless routers which have the WPS PIN feature. There is a design flaw that exists in the WPS specification for the PIN authentication. Essentially the flaw significantly reduces the time required to brute force the entire PIN, because it allows an attacker to know when the first half of the 8 digit PIN is correct.
Sometimes easier doesn't always mean good. Our Luma WiFi routers natively don't support WPS. As long as you use a strong password for your Luma network you will no longer be susceptible to such flaws!