Data-in-Motion is data that is currently traveling across a network or sitting in a computer’s Reliability, Maintainability, and Availability (RAM) ready to be read, updated, or processed. Data crossing over networks from local to cloud storage or from a central mainframe to a remote terminal should be encrypted so that it cannot be read or manipulated by any machine or Hacker between the data’s source and destination. This Data-in-Motion includes data moving across a cables and wireless transmission. It can be emails or files transferred over File Transfer Protocol (FTP) or Secure Shell (SSH).
Source: https://aspg.com/2014/09/03/three-states-digital-data/#.Xv_LBfJ7lgQ