Bitcoin ATM's are deployed worldwide. They are very useful, because you can buy and sell Bitcoins, as easy as you use your debit card on Bank's ATM. Some require ID information and some not.
The buy process:
The first queation is to enter a Bitcoin address, if you have a wallet, or the BTM will create one. Then you enter fiat currency in the BTM and it is converted and sent to the reqiured address (yours or new). If it's a new address, the BTM prints the Public/Private keypair, so you can import them to a wallet later.
The sell process
You are prompted with an address, to send the Bitcoins to. Then you scan it with your device and initiate a send transaction from your wallet. When transaction is confirmed, you get the fiat cyrrency in the tray.