Explain the concept of reactivity in Vue.js

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Reactivity in Vue.js means that when data changes, the DOM automatically updates to reflect those changes. Vue achieves this through a reactive system that tracks dependencies and triggers updates when data changes.
Vue 3 uses ES6 Proxies to implement reactivity, which allows it to detect property additions, deletions, and array mutations that weren't possible in Vue 2's Object.defineProperty approach.

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