Imagine you pay your monthly phone bill on the last day of the month, but you actually used the phone every single one of those 30 days. The cash left your account on one day, but the benefit—the calls, texts, and data—spread across the whole month. That gap between when cash moves and when the real business activity happens is why adjusting entries exist. Without them, your financial reports would tell a story that's partly fiction, showing profit only when cash changes hands instead of when the business really earns or uses something.