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Backend development with Node.js involves building fast, scalable server-side applications using JavaScript. Node.js uses an event-driven, non-blocking I/O model, making it ideal for real-time applications like APIs, chat apps, and microservices. Popular frameworks include Express.js and NestJS.

Fullstack development combines frontend and backend skills to build complete web applications. Developers use technologies like HTML, CSS, JavaScript, React (frontend), and Node.js, Express, and databases like MongoDB or PostgreSQL (backend) to deliver end-to-end solutions.

Network security involves protecting computer networks from unauthorized access, misuse, or attacks. Key practices include firewalls, intrusion detection systems, encryption, and secure protocols. These measures ensure data confidentiality, integrity, and availability across digital systems.

Building responsive UIs involves creating web interfaces that adapt seamlessly to different screen sizes and devices. Frontend technologies like HTML, CSS (Flexbox, Grid), and JavaScript frameworks (React, Vue) are used to ensure accessibility, performance, and a consistent user experience across platforms.

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