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React is a JavaScript library for building user interfaces. It is used for creating interactive UIs by building reusable components. React is efficient and allows for fast updates and rendering of large-scale applications.

A closure is a function that retains access to its lexical scope even when the function is executed outside of that scope. This is useful when dealing with private variables in JavaScript.

JavaScript handles asynchronous code through callbacks, promises, and async/await. This allows JavaScript to handle multiple tasks without blocking the main thread, making it more efficient.

The CSS Box Model is a box that wraps around every HTML element. It consists of content, padding, border, and margin. Understanding the box model is essential for controlling layout and spacing.

Website performance can be optimized by minifying CSS, JavaScript, and HTML, optimizing images, lazy loading content, and reducing the number of HTTP requests.

The `==` operator checks for equality of values, but it performs type coercion, meaning it can compare different types of values. The `===` operator checks for both value and type equality, without coercion.

React Hooks are functions that let you use state and other React features without writing a class. Examples include `useState`, `useEffect`, and `useContext`.

The `this` keyword in JavaScript refers to the context in which a function is called. It can point to different objects based on how a function is invoked.

Media queries are a CSS technique used to apply different styles for different screen sizes and devices. This helps create responsive designs that adapt to various viewports.

`var` is function-scoped, while `let` and `const` are block-scoped. `const` is used for constants (values that should not be reassigned), while `let` allows for reassignment.

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