Greenshot is a lightweight and easy-to-use screenshot software designed for Windows that allows users to capture and annotate screenshots efficiently. It offers a range of features including capturing full-screen, active window, or user-defined regions. Users can also annotate and edit screenshots using arrows, text boxes, and highlights. Greenshot integrates with various productivity tools, enabling users to seamlessly export their captures to programs like Microsoft Office or image editing software, or even upload them directly to cloud-based platforms.