Total income minus total expenses; synonymous with profit.
Actually, the terminology is usually more precise than this.
"Net income" is used for after-tax profit before paying dividends; this is the number that's carried to the top of the cash flow statement.
What's left over after paying dividends is called "earnings available to common shareholders"; this is the number used to calculate earnings per share and the P/E ratio.
All of these numbers are shown on the income statement.