Analog signal is a continuous signal which represents physical measurements. They are generally denoted by sine waves and uses a continuous range of values to represent information. Analog signals are more likely to get affected reducing accuracy and are not flexible compared to a digital signal. Analog signal processing can be done in real time and consumes less bandwidth. They can be used in analog devices only. They are Stored in the form of wave signal.They are best suited for audio and video transmission.
Eg-Human voice in air, analog electronic devices.
Digital signal is discrete time signals generated by digital modulation. They are generally denoted by square waves and uses discrete or discontinuous values to represent information. They are less affected by noise response is analog in nature and flexible compared to an analog signal. There is no guarantee that digital signal processing can be done in real time and consumes more bandwidth to carry out the same information. They are Stored in the form of binary digits. They are best suited for Computing and digital electronics.
Eg- Computers, CDs, DVDs, and other digital electronic devices.