Fragmentation is the diversity of browsers, devices, and platform versions in use at any given point in time. This phenomenon occurs when some mobile users use older versions of an operating system, browser, or device, while others use newer versions. Fragmentation can be a problem for developers who must create different versions of the same application to ensure it works perfectly with various versions of a given OS. It can also be a problem for IT departments because various operating versions have different capabilities, making them harder to manage and secure.