Web app

A Web app is server-hosted software accessed via a standard browser (Chrome, Firefox), utilizing core technologies like HTML5, CSS3, and JavaScript to deliver dynamic, cross-platform functionality.

Web applications are dynamic, server-side programs delivered over secure HTTP/HTTPS, eliminating the need for local installation. This client-server model uses the browser for the presentation layer (HTML/CSS/JavaScript) and a backend (like Node.js or Python) for application logic and database interaction. This architecture ensures cross-platform compatibility (Windows, macOS, Android), which is why over 85% of modern businesses rely on them for operational efficiency (Source: W3C, 2020). They power critical Software as a Service (SaaS) platforms: Gmail, Salesforce, and Netflix are prime examples of this robust, scalable technology.

https://en.wikipedia.org/wiki/Web_application