Adobe Spark is an online and mobile design app developed by Adobe Systems that allows users to create social media graphics, web pages, and short videos. The document provides step-by-step instructions on how to sign up for an Adobe Spark account and create social media posts using the app's templates and editing features. These include adding and editing text, photos, icons, adjusting colors and layouts. The summary demonstrates how to replace backgrounds, add photos, and modify elements to customize social graphics that can then be shared on platforms like Facebook and Instagram.