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Stack is a data structure that operates on the LIFO (Last In, First Out) principle. In Swift, you can implement a stack using an array, adding push and pop methods to manage the elements.

Example of implementing a stack in Swift:

struct Stack<Element> {
    private var elements: [Element] = []

    mutating func push(_ element: Element) {
        elements.append(element)
    }

    mutating func pop() -> Element? {
        return elements.popLast()
    }

    func peek() -> Element? {
        return elements.last
    }

    var isEmpty: Bool {
        return elements.isEmpty
    }

    var count: Int {
        return elements.count
    }
}

// Usage:
var stack = Stack<Int>()
stack.push(10)
stack.push(20)
print(stack.pop() ?? "empty") // 20
print(stack.peek() ?? "empty") // 10

Such a stack can be used to store action history, navigation, and other tasks where the order of processing elements is important.