Summary:

• **What is Rails 8 Authentication?** Rails 8 is a popular tool that helps programmers build websites and apps. The newest version includes a built-in way to create login systems, which is code that lets people create accounts and sign in securely without needing extra tools.

• **Why is This Important?** Before Rails 8, programmers had to use extra add-ons called "Devise" to create login systems. Now that Rails 8 has this feature built-in, it makes building websites faster and easier because programmers don't need to add as many extra pieces.