VI is the file extension that is given by the LabVIEW development environment. VI files are used to store data that allows you to create LabVIEW projects based on them. The user can also execute a project from scratch, but using VI templates often shortens the process. Such a project is a so-called virtual instrument.

LabVIEW is a specific environment where the creation of a program is done by combining graphic symbols. It is used for research and simulation of the operation of real tools. It is a visual programming language.