Canary Release

CSS Modules are CSS files where all class names are locally scoped by default, meaning they're automatically transformed into unique identifiers at build time to prevent naming collisions. You import them into your JavaScript as an object and reference classes like `styles.button` instead of plain strings. This approach is natively supported by bundlers like Webpack, Vite, and Next.js, offering style isolation without the runtime overhead of CSS-in-JS.

A cron job is a time-based task scheduler originating from Unix systems that runs commands or scripts at specified intervals. The schedule is defined using a cron expression with five fields representing minute, hour, day, month, and weekday. Cron jobs are fundamental for automations like database backups, log rotation, report generation, and periodic data synchronization.

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.

React's Context API provides a way to pass data through the component tree without manually threading props through every intermediate level. You create a context with `createContext`, wrap a subtree with a `Provider`, and consume the value anywhere below with `useContext`. It's ideal for global concerns like themes, authentication state, or locale, but should be used judiciously since any change to context value re-renders all consuming components.

Terraform is an open-source Infrastructure as Code tool by HashiCorp that lets you define cloud and on-premise resources in declarative configuration files using HCL (HashiCorp Configuration Language). It builds a dependency graph of resources and applies changes incrementally, showing a plan before making any modifications. Terraform supports hundreds of providers including AWS, Azure, GCP, and Cloudflare, making it a de facto standard for multi-cloud infrastructure automation.

CI/CD (Continuous Integration / Continuous Deployment) is a set of practices that automate building, testing, and deploying code every time a developer pushes changes. Continuous Integration merges code into a shared branch frequently and runs automated tests, while Continuous Deployment automatically releases validated changes to production. Together they form the backbone of modern software delivery, reducing manual errors and accelerating release cycles.