Why computer understand 0and1 only why not 2'3?

Computers understand only 0s and 1s because they use a binary number system, which is based on two states: off (0) and on (1). This binary system aligns well with the electrical circuitry of computers, where transistors can easily represent these two states. While other number systems like decimal (base 10) can also represent values, binary is the simplest and most efficient for computer processing and data storage.