Imgix is a real-time image optimization and delivery platform. Instead of pre-generating and storing multiple image sizes (small, medium, large), you upload once to Imgix and use URL parameters to request specific variants. Imgix transforms on-demand (resize, crop, compress, convert format) and caches results globally. Practitioners integrate Imgix via URL API (add query parameters), use JS libraries for responsive images, and monitor performance via Imgix analytics. Result: smaller file sizes, faster delivery, simplified asset pipeline.