Web Development Intermediate

What is CDN (Content Delivery Network)?

A distributed network of servers that delivers web content to users from the geographically closest location.

CDNs cache content (images, CSS, JavaScript, videos) at edge servers worldwide. When a user requests content, it is served from the nearest edge server instead of the origin server, reducing latency and load.

Benefits include faster page loads, reduced bandwidth costs, DDoS protection, and high availability. Popular CDNs include Cloudflare, AWS CloudFront, Akamai, and Fastly.

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Web Accessibility (a11y)

The practice of designing websites that can be used by people with disabilities, following WCAG guidelines.

A communication protocol that enables full-duplex, real-time data exchange between a browser and server over a single connection.

DOM (Document Object Model)

A programming interface for HTML documents that represents the page structure as a tree of objects that can be manipulated with JavaScript.

REST (Representational State Transfer)

An architectural style for designing networked applications using standard HTTP methods and stateless communication.

An HTML element that tells search engines which URL is the preferred version of a page when duplicate or similar content exists at multiple URLs.

The second major version of HTTP that improves performance through multiplexing, header compression, and server push.

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