Wifi dongle is a usb wifi adapter.

Official Raspberry Pi wifi dongle, Edimax, ThePiHut

Edimax EW-7811Un 150Mbps 11n Wi-Fi USB Adapter, Nano Size Lets You Plug it and Forget it, Ideal for Raspberry Pi / Pi2, Supports Windows, Mac OS, Linux (Black/Gold)

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  • This low cost, highly reliable wifi dongle is supported in Raspbian and other Raspberry Pi / Linux distributions. This Raspberry Pi mini wifi dongle has a very small form factor and fits most Raspberry Pi cases. The dongle is fully compliant with Linux and works right out of the box: no setup, drivers, or other configuration needed.

    Control your robot remotely with this Mini Wifi Dongle. Remotely control and program your , , and Raspberry Pi project. We have tested this model and it works with all versions of the Raspberry Pi.

  • Well there’s always the cost isn’t there? Both the offical Raspberry Pi WiFi dongle and ThePiHut dongle are £6, but the best price I can find for an Edimax is £8.23 from Amazon.

    Well firstly, Edimax signal strength data can’t be compared with the others, which is a bit of a nuisance. Edimax was my favourite wifi dongle for a long time because it had the lowest power consumption in my tests.

  • In each location the Pi was placed in such a way that it would be possible to exchange the wifi dongle without moving the Pi. This is quite important because the orientation of the dongle can make a large difference to the reported signal strength. I wanted all the results to be truly comparable. You can test this with your phone and WiFi Analyser. If you flip it from horizontal to vertical, I can almost guarantee you’ll get a change in signal strength.

CE certification,Plug Play 300Mbps WiFi Dongle compliant 802.11b 802

A wifi dongle is a device that plugs into a USB port on your computer. You'll then have a wireless connection which you can use on the go - whether that be in a cafe, your local park or on your daily commute.