In Go, arrays and slices are related, but they’re not the same thing:

Array

• Fixed-size collection of elements of the same type.

• Size is part of its type → [5]int and [10]int are different types.

• Stored contiguously in memory.

• Example:

  arr := [3]int{1, 2, 3} // length fixed at 3
  

Slice

• A descriptor (a lightweight data structure) that wraps around an underlying array.

• Contains three fields internally:

  • A pointer to the underlying array.
  • A length (len).
  • A capacity (cap).

• Dynamic size → you can grow/shrink it (within capacity, or by allocating a new array behind the scenes).

• Example:

  s := []int{1, 2, 3}   // slice, backed by an array
  s = append(s, 4, 5)   // can grow
  

✅ So your statement is correct:

The key difference is that arrays have a fixed size, while slices are flexible views into arrays that can grow and shrink.

👉 A nice way to put it:

• Array = value container (fixed length, rarely used directly).
• Slice = window into an array (resizable, used almost everywhere in Go code).