EaselJS is a JavaScript library that simplifies the process of creating and managing graphics and animations in web applications. It provides a rich set of features for working with the HTML5 Canvas element, allowing developers to draw shapes, images, and text easily. With its object-oriented approach, EaselJS makes it straightforward to manipulate visual elements on the screen. The library is part of the CreateJS suite, which includes other tools for sound, preloading, and interactivity. EaselJS is particularly useful for game development and interactive applications, as it supports features like event handling and animation timelines, enhancing the user experience.