Operating system advocacy is the practice of attempting to increase the public awareness and improve the perception by customers of a computer operating system. The motivation behind this may be to increase the number of users of a system, to assert the superiority of one choice over another or out of brand loyalty, pride in an operating system's abilities, or, with open source operating systems, political or philosophical reasons, or to persuade software vendors to port specific applications or device drivers to the computing platform. It is generally done in support of increasing network effects for the platform.