How does an ENA work?

Could you please explain in detail how an ENA operates? I'm quite curious about its underlying mechanisms and functionalities. Could you break down the steps involved in its working process? Additionally, it would be helpful if you could also mention any specific features or advantages that ENA offers compared to other similar systems. I'm interested in understanding its unique selling points and how it differs from the competition. Thank you for taking the time to explain this to me.