What is the difference between WPA and WPA2 encryption?

WPA encryption uses symmetric keys, and WPA2 encryption uses asymmetric keys.

WPA encryption acts at Layer 3, and WPA2 encryption acts at Layer 2.

WPA encryption works only with preshared key (PSK) authentication, and WPA2 encryption works with both PSK and 802.1X.

WPA encryption uses TKIP by default, and WPA2 encryption uses AES by default.