Wikipedia says: “Sketch is a vector graphics editor for macOS developed by the Dutch company Sketch B.V. It was first released on 7 September 2010 and won an Apple Design Award in 2012. It is primarily used for user interface and user experience design of websites and mobile apps and does not include print design features.”

Wikipediua says: “Sketch is used primarily for designing the UI and UX of mobile apps and web. The files designed in Sketch are saved in its own .sketch file format, though .sketch files can be opened in Adobe Illustrator, Adobe Photoshop, and other programs” such as Figma.