Vue.js is a progressive, MVVM-based JavaScript framework that uses a declarative, reactive data-binding system, component-based architecture, and a virtual DOM for efficiently building user interfaces and managing application state.

Vue.js architecture is based on a reactive data binding system and a component-based structure, enabling the creation of dynamic user interfaces through a view layer supported by optional libraries and tools for state management and routing.

Virtual DOM: …

Web Component: Reusable and self-contained blocks of code encapsulating templates, logic, and styles.

Reactive Data Binding: The core feature that automatically synchronizes the UI with the underlying data model using a reactive system.

Directives: Special attributes in templates for DOM manipulation.

Template Syntax: Declarative syntax to bind data to the DOM using curly braces ({{ }}) and directives.

Vue Instance: The root object that manages the lifecycle of a Vue app, created using new Vue() or createApp() in Vue 3.

Props: Pass data from parent to child components.

Events: Emit events from child to parent components.

Lifecycle Hooks: Methods like created(), mounted(), updated(), and destroyed() allow you to perform actions at different stages of a component's lifecycle.

Computed Properties: Derived state that updates reactively based on dependencies, reducing boilerplate code.

Watchers: Observe changes to data properties and perform actions in response.

Slots: Enable content distribution in components to make them more reusable and customizable.

Routing (Vue Router): Manage navigation and map URLs to components in single-page applications.

State Management (Vuex or Pinia): Centralized state management tools for managing and sharing application state across components.

Reactive APIs (Vue 3): Tools like ref(), reactive(), and computed() introduced in Vue 3’s Composition API for managing state and reactivity.

Single File Components (SFCs): Files with .vue extension encapsulating template, script, and style in one file.

Plugins: Extend Vue's functionality with reusable plugins for tasks like validation or analytics.