The reason that only use two values for Number System is that the encoding process must be unique for enable accurate reaction. Besides, the encoding process must be full complete. That’s why it is so strong. It can represent into any message what we used in our usual life, and it can help people process info very fast and accurate.
Decimal system is called: A Base-10 System which is other kind of system we are very familiar with, Decimal system uses 10 numbers to represent values, in contrast,Binary uses 2 numbers system which is more and more complex for system to recognize.
Binary code is very useful for our life, because it can help people process info in very fast, safe, unique way.