Sometimes you just want to enable Wifi on your Raspberry Pi without leaving your laptop or desktop. I get it.

Luckily Raspbian has made this really easy. You just need to add a file wpa_supplicant.conf to the root of the SD card.

The file contents look like this:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev

    ssid="your network's Wifi name here"
    psk="your network's Wifi password here"

Then eject your SD card and plug it into the Pi. It should automatically connect to your Wifi.