OMG! Really? Bitcoin ATM? Machine which can give you real money for BTC on the street?
"Real money" 
But yes, you can exchange fiat money for BTC. A lot of machines only allow you to buy BTC as one of the biggest purposes of these machines is anonymity for the buyer (paying with cash), and for people trying out BTC for the first time due to the machines' high fees, but some allow you to sell BTC as well.
How many countries has it?
https://coinatmradar.com/countries/What is the exchange rate in them?
Often ATMs have a fee of about 4-10% depending on how much competition there is in the area and what company operates them.