A screenshot tool is a software application that allows users to capture images of their computer or mobile device screens. This tool can be used to take snapshots of specific areas, entire screens, or even scrolling windows. It is helpful for creating tutorials, sharing information, or saving important content for later reference. Many screenshot tools come with additional features, such as annotation options, which let users add text, arrows, or highlights to the captured images. Popular examples of screenshot tools include Snagit, Greenshot, and built-in options in operating systems like Windows and macOS.