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The View Transitions API is a browser-native way to create animated transitions between different DOM states or page navigations, previously only possible with complex JavaScript animation libraries. It captures a snapshot of the current state, applies the DOM update, then animates between the old and new snapshots using CSS. This API works for both single-page app state changes and multi-page navigations, enabling smooth page transitions with minimal code that feels native to the platform.

Next.js is a full-stack React framework by Vercel that provides server-side rendering, static site generation, API routes, file-based routing, and built-in optimizations out of the box. Its App Router (introduced in v13) uses React Server Components by default, enabling a new paradigm of server-first rendering with selective client-side interactivity. Next.js has become the de facto standard for production React applications due to its performance optimizations, developer experience, and deployment flexibility.

Deep linking is the ability to direct users to a specific screen or content within a mobile or web application via a URL, rather than just opening the app's home screen. In React Native and Flutter, this involves configuring URL schemes (e.g., `myapp://profile/123`) or universal/app links that work across platforms. Deep linking is essential for push notification routing, marketing campaigns, sharing content between users, and creating seamless web-to-app transitions.

CSS Custom Properties (also called CSS Variables) let you define reusable values with `--my-variable` syntax and reference them anywhere using `var(--my-variable)`. Unlike preprocessor variables in Sass or Less, they are live in the browser, cascade through the DOM, and can be updated dynamically with JavaScript. They're essential for theming systems, dark mode implementations, and maintaining consistent design tokens across large stylesheets.

Auto-scaling is the ability of a system to automatically adjust the number of running instances or allocated resources based on current demand. When traffic spikes, new instances are provisioned; when demand drops, excess resources are released to save costs. Cloud platforms like AWS, GCP, and Azure offer auto-scaling groups with configurable policies based on CPU usage, request count, queue depth, or custom metrics.

A design system is a collection of reusable components, guidelines, and standards that ensure visual and functional consistency across a product or suite of products. It typically includes a component library, design tokens, typography rules, color palettes, and documentation. Design systems bridge the gap between designers and developers, enabling teams to build interfaces faster while maintaining a unified look and feel.