Vue.js: What is the difference between Vue 2 and Vue 3?

Vue 3 — Composition API, better performance.

1// Vue 2
2export default {
3    data() { return { count: 0 } }
4}
5
6// Vue 3
7import { ref } from "vue"
8const count = ref(0)

• Vue 2 — Options API.
• Vue 3 — Composition API.
• Vue 3 — faster.
• Vue 3 — smaller.