A Virtual Instrument is a software-based tool that simulates the functionality of traditional physical instruments, such as oscilloscopes or multimeters. These instruments run on computers or mobile devices, allowing users to perform measurements, analyze data, and visualize results without needing the actual hardware. Virtual instruments often come with user-friendly interfaces and can be customized to suit specific needs. They are widely used in fields like engineering, education, and research, providing flexibility and accessibility. Popular examples include software like LabVIEW and MATLAB, which enable users to create complex measurement systems easily.