What was john von neumann discovery?

Answer 1

John Von Neuman founded the theory of stored program

(stored program concept states "to make a computer work the necessary set of instructions in the form of a program could be stored in one of the components of the system using binary representations so that the operation would be fast and efficient (accurate) so developed program could be modified as user's requirements)

his theory leaded for the creation on R.A.M(Random access memory)

Neumann proposed that binary number system should be used in computer instead of decimal