Where in memory is a slice created in Go?

In Go, a slice is a structure that contains a pointer to an array, a length, and a capacity. The slice itself (the structure with these three fields) is usually created on the stack if it is local, or on the heap if it is part of a more complex structure or returned from a function.

However, the data that the slice references (i.e., the array itself) is always located on the heap if dynamically allocated, or in static memory if it is a fixed-size array.

For example:

func example() []int {
    arr := []int{1, 2, 3}
    return arr
}

Here, arr is a slice, a structure that can be on the stack, but the array with its elements is on the heap so that the data persists after the function exits.

Thus, a slice is a small structure in memory (usually on the stack) that points to an array on the heap.