Data can be analog or digital. The term analog data refers to information that is continuous; digital data refers to information that has discrete states. Analog data take on continuous values. Digital data take on discrete values. Signals can be analog or digital. Analog signals can have an infinite number of values in a range; digital signals can have only a limited number of values. Here briefly analyze Data and Signals in terms of Data Communication and Networking. Topics discussed in this study: Analog and Digital Data; Analog and Digital Signals; Periodic and Nonperiodic Signals.