As you already know, a stack is a data structure realizing the so-called LIFO (Last In - First Out) model. It's easy and you've already grown perfectly accustomed to it. Let's taste something new now.

queues to a FIFO (First-In-First-Out) Amazon Simple Notification Service (Amazon SNS) topic. Create a FIFO topic. Topic names must be made up of only uppercase and lowercase ASCII letters, numbers, ...