What is the purpose of step 2 (modify the PC) in the fetch-decode-execute cycle? What would happen if this step were omitted?

This are the steps:-

a) Fetch the next instruction from memory into IR.

b) Change PC to point to the next instruction.

c) Determine the type of instruction just fetched.

D) If the instruction uses a word in memory, determine where it is.

E) Fetch the word, if needed, into a CPU register.

F) Execute the instruction (running the operands through the data path).

G) Go to step 1 to begin executing the next instruction.