Sketch is a vector-based design tool for Mac with a focus on screen design. It’s used primarily by screen designers who create websites, icons, and user interfaces for desktop and mobile devices.In architecture, buildings are made from the ground up using detailed plans called blueprints which are made of lines. These lines also are used in user experience where apps and experiences are planned out using wireframes sketched in so that users can test these experiences at the lowest fidelity to flesh out the most intuitive experience.