A web app must have these 10 essential features: responsive design for compatibility across devices, intuitive user interface (UI) for ease of use, strong security measures to protect data, fast loading times to enhance user experience, offline functionality for convenience, real-time updates to keep content fresh, seamless integration with third-party services, multi-language support for a global audience, user-friendly authentication systems, and scalable architecture to accommodate growth. These features ensure a smooth, secure, and efficient user experience.

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