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Next.js uses a file system routing approach, where each file in your `pages` directory corresponds to a page on your website. This makes defining routes incredibly simple. For example, if you have a file named `about.js` in the `pages` directory, it will automatically create a route at `/about`. Next.js also supports dynamic routes, allowing you to create pages with variable data. This is achieved using square brackets in the file name. For instance, a file named `[id].js` would create a route that can handle any URL like `/1`, `/2`, `/3`, and so on. This is especially useful for creating pages that display dynamic content like blog posts or product details.

Next.js provides numerous benefits that make it a popular choice for React developers. One key benefit is its focus on performance. Features like server-side rendering and static site generation ensure fast loading times and a smooth user experience. This also enhances SEO by making your website more crawlable by search engines. Next.js also simplifies the development process by providing built-in features like routing, data fetching, and automatic code splitting. This allows you to focus on building your application instead of managing complex configurations. For example, Next.js's built-in routing system allows you to create pages with dynamic routes, easily fetching data for each page. This makes creating complex applications like e-commerce sites or blogs much easier and more efficient.

Next.js is a React framework that simplifies building user interfaces and applications. It extends the functionalities of React by providing features such as server-side rendering (SSR) and static site generation (SSG). SSR allows you to render your components on the server and deliver pre-rendered HTML to the browser, improving SEO and initial load times. SSG generates static HTML pages at build time, making your website incredibly fast and scalable. For example, if you have a blog post, Next.js can generate a static HTML page for that post, which can be served quickly to users. This makes your website more performant and improves user experience.

The 'reduce' method iterates through an array and applies a function to each element, accumulating the result into a single value. For example, `[1, 2, 3, 4].reduce((sum, num) => sum + num, 0);` will result in `10` (the sum of all elements). The initial value (`0`) is the starting point for the accumulator.

The 'sort' method modifies the original array in place. By default, it sorts elements alphabetically or numerically. To sort in ascending order, you can use a custom compare function. For example, `[3, 1, 4, 2].sort((a, b) => a - b);` results in `[1, 2, 3, 4]`.