Why is a decrease in accounts payable shown as a decrease in cash when computing cash flow

Question:

Why is a decrease in shown as a decrease in cash when computing cash flow from operations?

Accounts Payable
Accounts payable (AP) are bills to be paid as part of the normal course of business.This is a standard accounting term, one of the most common liabilities, which normally appears in the balance sheet listing of liabilities. Businesses receive...