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The main difference between Harvard architecture and Von Neumann architecture is that in the Harvard architecture, the instruction and data memories are completely separate. This allows for faster access to the instruction memory and makes it easier to modify a program without having to rewrite the entire code.
Examples of Harvard architecture include the Motorola 68000 and the Intel 8051 microcontrollers.
Examples of Von Neumann architecture include the IBM PC and the Apple Macintosh.
Harvard architecture is used instead of Von Neumann because it allows for faster access to the instruction memory and makes it easier to modify a program without having to rewrite the entire code. Additionally, because the instruction and data memories are separate, it is more secure and can help prevent malicious code from being executed in the system.