Microsoft produces a large amount of enterprise applications, and so it is natural that software licensing is one of their core business components. A software license is the right of a user to install and use a specific piece of software. Most retail applications have a single user license, meaning it can be installed and used on only one computer. For corporations or other institutions, volume licensing can be purchased for multiple computers. Microsoft software licensing usually deals in large numbers, so often there are discounts available at different levels, such as purchasing 100 licenses over 25.