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An Analog Signal are continuous electrical signals that vary in time, most of the time the variations follow that non-electric signal, thus analogous and that is why it is called an analog signal.
The most common property that is used by an analog signal is voltage, followed by frequency, current and charge.
One of the disadvantages of the Analog Signal compared to the digital signal is the fact that analog signalling can contain noice, random unwanted variation.
According to Wikipedia an Analog Signal is:
"An Analog or analogue signal is any continuous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity, i.e analogous to another time varying signal. It differs from a digital signal in terms of small fluctuations in the signal which are meaningful. Analog is usually thought of in an electrical context; however, mechanical, pneumatic, hydraulic, and other systems may also convey analog signals."