Beginners' Guide to Financial Statements

Operating Activities

The first part of a cash flow statement analyzes a company’s cash flow from net income or losses. For most companies, this section of the cash flow statement reconciles the net income (as shown on the income statement) to the actual cash the company received from or used in its operating activities. To do this, it deducts from net income any non-cash items (such as depreciation expenses) and any cash that was used or provided by other operating assets and liabilities.

Investing Activities

The second part of a cash flow statement shows the cash flow from all investing activities, which generally include purchases or sales of long-term assets, such as property, plant and equipment, as well as investment securities. If a company buys a piece of machinery, the cash flow statement would reflect this activity as a cash outflow from investing activities because it used cash. If the company decided to sell off some investments from an investment portfolio, the proceeds from the sales would show up as a cash inflow from investing activities because it provided cash. 

Financing Activities

The third part of a cash flow statement shows the cash flow from all financing activities. Typical sources of cash flow include cash raised by selling stocks and bonds or borrowing from banks. Likewise, paying back a bank loan would show up as a use of cash flow.

Source: http://www.sec.gov/investor/pubs/begfinstmtguide.htm