Environment variables generally refer to some parameters used in the operating system to specify the operating environment of the operating system, such as the location of temporary folders and system folders. An environment variable is an object with a specific name in the operating system that contains information that will be used by one or more applications. For example, the path environment variable in Windows and DOS operating systems, when the system is asked to run a program without telling it the full path where the program is located, the system should not only look for the program in the current directory, but also go to the path specified in path. Users can better run processes by setting environment variables.
