Introduction to  Counters I remember my childhood, at a time even before going to the primary school, we used to play with pebbles, soon we started counting the pebbles. When I joined school, I realized that counting is part of our life and is used in every walk of life, count starting from zero, or starting from any number (preset). As I grew, I found counting used for different purpose; we go to refuel our vehicle, there a meter that counts the amount and the quantity of fuel; counting the marks awarded to student in an exam; days temperature, population of a city/ country, counting the score in a match, number of votes obtained by a candidate in an election, number