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Investment Bank from WikiPedia:

An investment bank is a financial institution that raises capital, trades in securities and manages corporate mergers and acquisitions. Investment banks profit from companies and governments by raising money through issuing and selling securities in capital markets (both equity, debt) and insuring bonds (e.g. selling credit default swaps), as well as providing advice on transactions such as mergers and acquisitions. A majority of investment banks offer strategic advisory services for mergers, acquisitions, divestiture or other financial services for clients, such as the trading of derivatives, fixed income, foreign exchange, commodity, and equity securities.

In terms of regulatory qualification, to perform these services in the United States, an adviser must be a licensed broker-dealer, and is subject to Securities & Exchange Commission (SEC) (FINRA) regulation. Until the late 1980s, the United States maintained a separation between investment banking and commercial banks. Other industrialized countries (including G7 countries) have not maintained this separation historically.

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