Elementor is a popular website builder and page builder plugin for WordPress. It allows users to create and design custom pages and posts using a drag-and-drop interface without coding knowledge. Elementor includes a wide range of design elements and features, such as forms, sliders, and animations, and also includes a wide range of widgets and third-party integrations. It also has a built-in responsive design feature that allows users to see how their site will look on different devices.