Redux

Hydration is the process where a client-side JavaScript framework attaches event listeners and interactivity to server-rendered HTML markup. After the server sends pre-rendered HTML for fast initial display, the framework "hydrates" it by reconciling its virtual representation with the existing DOM and making it interactive. Hydration can be expensive on complex pages, which has led to innovations like partial hydration, progressive hydration, and React's selective hydration with Suspense.

A component library is a curated set of pre-built, reusable UI elements — buttons, inputs, modals, cards — packaged for consistent use across projects. Libraries like Material UI, Chakra UI, or Radix provide accessible, themeable building blocks so developers don't have to reinvent common patterns. A well-maintained component library drastically reduces development time and ensures visual consistency throughout an application.

Accessibility (often abbreviated a11y) is the practice of designing and building websites and apps so they can be used by everyone, including people with visual, motor, auditory, or cognitive disabilities. This involves proper semantic markup, keyboard navigation support, sufficient color contrast, and screen reader compatibility. Beyond being an ethical responsibility, accessibility is increasingly a legal requirement in many jurisdictions.

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.

Flexbox (Flexible Box Layout) is a one-dimensional CSS layout model designed for distributing space and aligning items within a container along a single axis — either horizontal or vertical. It excels at handling dynamic content sizes, centering elements, and creating flexible navigation bars, card rows, and form layouts. Properties like `justify-content`, `align-items`, and `flex-grow` give you fine-grained control over how items share available space.

CSS Grid is a two-dimensional layout system that lets you define rows and columns simultaneously, making it ideal for complex page layouts. Unlike Flexbox which works in one axis at a time, Grid allows you to place items precisely in both horizontal and vertical directions using named areas or line numbers. Features like `grid-template-areas`, `auto-fill`, and `minmax()` make it possible to create responsive layouts with minimal code.