Was ist ein Bitcoin-Automat?

Could you please elaborate on what a Bitcoin ATM is? In layman's terms, how does it function? Are these ATMs widely available? What are the main benefits of using a Bitcoin ATM compared to traditional banking methods? Also, are there any security concerns associated with these ATMs? Additionally, do you foresee a significant rise in the number of Bitcoin ATMs in the near future? Lastly, how do users ensure they are dealing with a legitimate Bitcoin ATM and not a scam?