ATM stands for Automated Teller Machine, it is also called a minibank, cashline, or cashpoint in other countries. There are approximately 3 million ATMs in operation around the world. I try to avoid using ATMs because of the fee that sometimes gets added to any transaction. But, it is sometimes necessary to use one.
But, there is a new scam out there that you need to be aware of. What will happen is your identity gets stolen. See this picture? Looks like an ATM, right?

Image Credit: Imgur
It was found at a gas station in Houston, and it is not a real ATM, it is called a skimmer. It will take your card, and get your PIN.

Image Credit: Imgur
Then anyone who has that info can use the money in your bank account. See this box?

Image Credit: Imgur
It is a camera that is recording the numbers as you type your PIN on the keypad.

Image Credit: Imgur