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The stack stores values in the order it gets them and removes the values in the opposite order. Think of a stack of plates: when you add more plates, you put them on top of the pile, and when you need a plate, you take one off the top.

Adding or removing plates from the middle or bottom wouldn’t work as well! The stack is fast because of the way it accesses the data: it never has to search for a place to put new data or a place to get data from because that place is always the top.

If someone in your group comes late, they can ask where you’ve been seated to find you. Although the feature is straightforward to explain, it has deep implications for the rest of the language.All programs have to manage the way they use a computer’s memory while running.Parts of ownership will be described in relation to the stack and the heap later in this chapter, so here is a brief explanation in preparation.Both the stack and the heap are parts of memory that is available to your code to use at runtime, but they are structured in different ways.