Removable media is
|“||[s]torage media that can be easily removed from a system and is designed for removal, for example USB flash drives or optical media.||”|
These devices are typically used to store, archive, transfer, and transport data and other information. They help users share data, information, applications, and utilities among different computers and other devices.
"The use of removable media (e.g., flash drives, CDs, and external hard drives) on an organization's network poses a significant security threat. Without proper protection, these types of media provide a pathway for malware to move between networks or hosts. Following proper security measures when using removable media devices is necessary to decrease the risk of infecting organization's machines or the entire network."