Adobe XD is a user experience design software application developed by Adobe Systems. It is used by designers and developers to create wireframes, prototypes, and interactive designs for websites, mobile apps, and other digital products. 

Adobe XD offers a range of features and tools that make it easy for designers to create and share designs with their team or clients. Some of its key features include design tools for creating vectors, shapes, and text, as well as features for creating interactive prototypes with animations and transitions. 

Adobe XD also supports plugins and integrations with other Adobe products such as Photoshop and Illustrator, and offers collaboration features such as commenting and shared design libraries.