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An approach to web design that makes web pages render well on a variety of devices and window or screen sizes. Benefits: improved user experience, increased reach to mobile audience, and better search engine rankings.

The capability of a web application to function across different web browsers with the same performance and user experience. Benefits: wider audience reach, reduced maintenance issues, and consistent brand representation.

Snippets of text that describe a page's content; they don't appear on the page itself, but only in the page's code. Benefits: improved SEO, providing search engines with information about the page, and can influence click-through rates from the search results.

Functionality allowing a web app to work without an internet connection, typically achieved using service workers and caching. Benefits: improved user experience, accessibility in low connectivity areas, and potential for increased engagement.

A JSON file that describes the web application, providing information to the browser about icons, background color, display type, etc. Benefits: allows users to keep apps on their home screen, provides a full-screen experience, and ensures consistent branding.

Logical and straightforward URL paths that are easily understood by humans and search engines. Benefits: improved user experience, better SEO, and easier social sharing.

The inclusive practice of making your web apps usable by as many people as possible, including those with disabilities. Benefits: expands market reach, compliance with legal requirements, and improved user experience.

Areas of the screen designed to be easy for users to tap, which should be of an adequate size and spacing. Benefits: enhanced mobile usability, reduced user errors, and an increased speed of interaction.

The speed at which web pages are downloaded and displayed on the user's web browser. Benefits: improved user satisfaction, lower bounce rates, and potentially higher conversion rates.

Scripts that run in the background, separate from a web page, opening the door to features that don't need a web page or user interaction. Benefits: offline functionality, background syncing, and push notifications.

The secure version of HTTP, encrypting data exchanged between the client and server. Benefits: enhances security, builds user trust, and is a requirement for many new browser features.