Abstract: The emergence of modern web technologies has drastically transformed the landscape of digital communication, application development, and online system architecture. This paper investigates the evolution and impact of advanced web technologies such as single-page applications (SPAs), real-time data streaming, cloud-native infrastructure, and web componentization. Focusing on frameworks like React, Angular, and Vue, as well as backend technologies including Node.js, Django, and GraphQL, this research provides a multi-dimensional analysis of their contributions to interactivity and scalability. The study adopts a mixed-methods approach, incorporating prototype development, performance benchmarking, and developer feedback to evaluate these technologies in real-world conditions. Results reveal significant improvements in user experience, application responsiveness, and developer productivity. Recommendations address best practices for architecture, performance optimization, security, and accessibility. This paper concludes that modern web technologies provide a robust foundation for building scalable, engaging, and secure applications, with implications for future trends like edge computing and AI-enhanced development tools. Keywords: Web technologies, SPA, PWA, React.js, Vue.js, Angular, Node.js, GraphQL, WebSockets, real-time communication, REST API, performance optimization, accessibility, responsive design, CI/CD, WebAssembly, component-based architecture, DevOps, JWT authentication, HTML5, CSS3, JavaScript, security, micro frontends, SSR