Sketch is a vector-based design tool used primarily for web and mobile app UI/UX design. It offers a streamlined interface with a focus on simplicity and usability, making it a favorite among designers for creating high-fidelity prototypes and user interfaces. Sketch supports artboards, symbols, and reusable components, allowing for efficient design systems and collaboration. Although it is macOS-exclusive, it has a wide range of plugins and integrations with other tools. Sketch is especially popular in the design community for its ease of use and lightweight performance compared to other design software.