There are two types of signals used in different types of electronic circuits: they are analog and digital signals. The analog signal is a continuous signal having infinite variations within a particular span of time. It is uniform in nature. On the other hand, digital signal is discrete or discontinuous. It has abrupt variations within a particular span of time.

You can consider an analog signal just like a slope and the digital signal like steps made on it. When we convert analog signal into digital, something happens and we loss quality or the originality of the analog signal.

We can understand this concept with a simple example. Consider a slanted slope with a particularly small angle with ground, as shown here.

Now if a person is climbing up or coming down from this slope he has the FREEDOM of putting his steps as he likes. He can climb with longer steps or shorter steps, or one long step with other short or whatever the way he want to walk, with his particular style.

It means that the person has got the full continuity of slope to enjoy and put his steps the way his likes and the distance he likes, to…!

However, suppose we make steps on this slope, as shown in the following figure. Now with these steps there are lot of problems, as given below.

- Firstly, the continuity of slope is now broken.
- By making steps you are now defining that where you should put your step while climbing.
- Now you CANNOT STEP BETWEEN THE TWO STEPS…!!
- So if you compare the defined conditions of steps with the freedom of slope, you will see that YOU ARE ACTUALLY SPOILING THE INCESSANT BEAUTY OF SLOPE.

Now the question is: if you want to maintain the continuity of slope and still want to make steps, then how many steps would there be?

The answer is:You will require making INFINITE STEPS to maintain the continuity of the slope! But then what is the use of making such infinite steps…! Let there be the slope itself…!So in my view, when we convert analog into digital, we are actually spoiling the beauty of the analog signal, something is lost in-between the two steps…! Hence, perhaps, the nature does not have anything at all which is discrete or discontinuous like digital signal.