The numbers 0, 1, 2, and 3 are the first four digits in our counting system. 0 represents nothing or the absence of quantity, while 1 signifies a single unit. These numbers form the foundation of mathematics, helping us understand and describe the world around us. As we move to 2 and 3, we see the beginnings of pairs and small groups. 2 represents a couple or a duo, like two shoes, while 3 introduces the idea of a trio, such as three friends. Together, these numbers help us count, measure, and organize our lives.