Title: Progressive Web App (PWA) Author: Kriko Published: Feb 28, 2021 Last modified: Jul 13, 2026 --- 1. [Home](https://kriko.io/) / 2. [Glossary](https://kriko.io/glossary) / 3. P Letter # Progressive Web App **(PWA)** A **Progressive Web App**, commonly abbreviated as PWA, is a modern web application approach that allows websites to deliver an experience similar to a mobile app. PWAs run through the browser, but when configured properly, they can be added to the user’s home screen, opened in a full-screen or app-like interface, display certain content offline and send push notifications on supported devices. For this reason, PWA can be considered a structure that bridges the gap between web experience and mobile app experience. A PWA does not necessarily need to be downloaded from the App Store or Google Play like a traditional mobile application. When users visit the website through a browser, they may be able to add it to their device’s home screen if the required conditions are met. After this, the web application can appear with a separate app icon and can be opened from that icon. However, it is not accurate to say that every PWA will provide the same features on every device and browser. Features such as push notifications, offline use and adding to the home screen may vary depending on operating system, browser and device support. One of the most important features of Progressive Web Apps is their potential to provide a fast and uninterrupted experience. PWAs can cache certain files so that repeat visits load faster. Images, CSS, JavaScript files and specific page resources can be stored in cache. This allows content to load in a shorter time when the user revisits the same page. Especially in cases where connection quality is poor, a well-structured PWA can significantly improve user experience. Offline functionality in PWAs is enabled through an important technology called Service Worker. A **Service Worker** is a JavaScript file that runs between the browser and the network. It can control which files are cached, what content is shown when the user is offline and how network requests are managed. For example, previously opened articles on a news website can be read offline, or certain pages on an e-commerce site can still load when the connection is weak through Service Worker logic. However, the offline functionality of PWAs should be understood correctly. Not every PWA has to work with all features without an internet connection. Offline support depends on how the application is designed and which data is cached. For example, users may view previously loaded content, save a form draft or queue an action. When the internet connection returns, these actions can be synchronised. However, actions that require real-time data may work only in a limited way without a connection. Another important component of a PWA is the **Web App Manifest** file. The manifest is usually prepared in `manifest.json` format and contains information such as the application name, short name, icons, theme colour, background colour, start URL and display mode. This file helps the browser understand how the web application should be added to the device’s home screen and how its app-like appearance should be presented. The manifest file plays an important role in giving the user a more natural app-like experience. HTTPS usage is a critical requirement for PWAs. Powerful browser features such as Service Worker work only over secure connections. The reason is that a PWA can manage network requests, cache data and, in some cases, send notifications to users. Allowing such features over insecure connections could create risks for user data. Therefore, HTTPS should be treated as a standard requirement in PWA development. Progressive Web Apps should be designed to adapt to different screen sizes. Responsive design, fast loading, accessibility, touch-friendly usage, readable text and simple navigation are important parts of the PWA experience. A PWA is not just a website that can technically be added to the home screen; it is a holistic experience designed to give users a mobile app-like sense of speed, simplicity and trust. For this reason, performance, design and technical infrastructure should be considered together. In summary, a **Progressive Web App** is a modern web technology approach that helps websites provide a faster, more reliable, accessible and app-like experience. When configured correctly, it allows users to add the web application to their home screen without visiting an app store, access certain content offline and experience faster performance. 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