How does online banking work, and is it safe to use?

I want to understand how online banking works in everyday life. How do banks allow users to access their accounts, transfer money, and pay bills through websites or mobile apps? I’ve seen major banks like Wells Fargo and Citibank offer online banking services, but I’m curious about the technology behind it.

Also, how safe is online banking? What security measures (like encryption or authentication) are used to protect user data and prevent fraud? Are there any risks users should be aware of, and how can they stay secure while using online banking?

How does online banking work, and is it safe to use?