A more thorough explanation:

Cash flow refers to the movement of money in and out of a business. It is a measure of how much money a business generates or spends over a given period of time.

• When a customer pays for a product or service, it is considered cash inflow.
• When a business pays for rent, salaries, or other expenses, it is considered cash outflow.
• If a business has more cash inflow than outflow, it has a positive cash flow.
• If a business has more cash outflow than inflow, it has a negative cash flow.

These examples illustrate how cash flow can be used to measure a business's profitability and liquidity. A positive cash flow means a business has more money coming in than going out, which can indicate financial stability. A negative cash flow means a business is spending more money than it is making, which can lead to financial difficulties.