Digital versus Analog

Your question is too broad!

It is like asking which is more colorful, red or yellow?

Process or Data. It would be cumbersome to process an error voltage for implementing a simple voltage regulator when you can purchase an "analog" device to do an adequate job for twenty five cents. However, and especially with the speed of digital processors these days, there are some things that would be more cumbersome if not impossible to do in analog. Every application has to be assessed individually to determine how the balance of priorities drives the design to form a solution that best addresses those criteria. Even beyond that, every designer will incorporate their own biases based on their particular mix of expertise.

Shall be very grateful if you can explain with typical applications, as examples, under analogue and digital systems.

Due to the broad nature of your question, to go beyond a broad and general answer and provide the kind of illustration you request would require considerable time and effort and is beyond the scope of what is practical to do in just a few minutes. I suggest that you review the electronic trade and hobby magazines and books and consider how different applications and projects might be done if they were to be implemented in a different way. However, should I think of any simple illustrations I will pass them along later.

Digital

These are a series of extensive pdf. documents covering measurement and control. The Data Acquisition literature might get you started. See http://www.omega.com/literature/transactions/.

Analog is often simple when you need only yes and no type control. One comparator can do it. To make it digital it needs a lots of design parts.

Digital world always use lots of analog so digital world is not complete by itself. Even parts like ADC are actually analog blocks.

World is analog. Electronics engineers escaping analog are never complete engineers. Analog world and digital world, both are full of challenges. While both analog and digital engineers often design instruments together, computers are nearly close to 90% digital world. If you are a narrow domain specialist engineer then you can work in limited area.

Shyam
MD Sensors Technology