Trooper1270: Never used AirDroid, so not sure how it works
That's a combination of Website and an app.
When both devices are in the same network, you open
http://web.airdroid.com Then start the android app, scan the QR code. Voilá, full access to all files and data the app has access rights to.
You see an overview of pictures, contacts, videos, music or uncategorized files, also some system settings, can upload and download as you please. You can also use it to mirror one device to another.
It's also possible in different networks, but then it requires an account for verification.