How do ATMs work in Spain?

Could you kindly explain how ATMs operate in Spain? I'm quite curious about the technological process behind their functionality. Do Spanish ATMs utilize any unique technology or systems? Are there any specific steps or procedures that customers need to follow to withdraw cash? Also, how secure are these machines, and what measures are taken to protect customers' financial information? Lastly, are there any common challenges or issues that customers might encounter when using ATMs in Spain? I'd appreciate it if you could provide a detailed breakdown of the ATM operation process in Spain.