Golang - Differences between Array and Slice

array_vs_slice.go

package main

import (
	"fmt"
	"reflect"
	"strings"
)

func main() {
	// Arrays, slices (and strings)
	// http://blog.golang.org/slices
	// Playground: http://play.golang.org/p/94mqg0BxiQ

	// Nil slice has length and capacity of 0
	var a []int
	// Error: throws an index out of range
	// a[0] = 1;
	// Must append to nil slice
	a = append(a, 4)
	// Outputs: [4] []int
	fmt.Println(a, reflect.TypeOf(a))

	// Fixed-size slice has length of 2 and capacity of 2
	b := []int{1, 2}
	b = append(b, 3)
	// Outputs: [1 2 3] []int
	fmt.Println(b, reflect.TypeOf(b))

	// Empty slice has length of 2 and capacity of 0
	c := make([]int, 2)
	c[0] = 5
	c = append(c, 6)
	// Outputs: [5 0 6] []int
	fmt.Println(c, reflect.TypeOf(c))

	// Empty array has length of 2 and capacity of 0
	var d [2]int
	d[0] = 7
	d[1] = 8
	// Outputs: [7 8] [2]int
	fmt.Println(d, reflect.TypeOf(d))
	
	// String array
	var s1 [2]string
	s1[0] = "Yes"
	s1[1] = "No"
	// This will ERROR
	//fmt.Println(strings.Join(s1, ","))
	
	// String slice
	s2 := make([]string, 2)
	s2[0] = "Yes"
	s2[1] = "No"
	// This will work
	fmt.Println(strings.Join(s2, ","))
}

How here i will find difference between array and slice :

// Nil slice has length and capacity of 0
var a []int

// Empty array has length of 2 and capacity of 0
var d [2]int

I have alot confusion between them