The smallest unit of a digital display, a single point of color that combines with millions of others to form images. Understanding pixel dimensions helps you provide appropriate image sizes for different devices. Retina displays pack more pixels into the same space, requiring higher-resolution images for sharp display.

Meta tags controlling how pages appear when shared on Twitter, including image, title, and description. Properly configured Twitter cards increase click-through from social shares. Test cards using Twitter's card validator before launch.