A financial market is a market in which people trade financial securities and derivatives at low transaction costs. Some of the securities include stocks and bonds, raw materials and precious metals, which are known in the financial markets as commodities.

The term "market" is sometimes used for what are more strictly exchanges, that is, organizations that facilitate the trade in financial securities, e.g., a stock exchange or commodity exchange. This may be a physical location (such as the New York Stock Exchange (NYSE), London Stock Exchange (LSE), Bombay Stock Exchange (BSE), or Johannesburg Stock Exchange (JSE Limited)), or an electronic system such as NASDAQ. Much trading of stocks takes place on an exchange; still, corporate actions (mergers, spinoffs) are outside an exchange, while any two companies or people, for whatever reason, may agree to sell the stock from the one to the other without using an exchange.

Trading of currencies and bonds is largely on a bilateral basis, although some bonds trade on a stock exchange, and people are building electronic systems for these as well.

Within the financial sector, the term "financial markets" is often used to refer just to the markets that are used to raise finances. For long term finance, they are usually called the capital markets; for short term finance, they are usually called money markets. The money market deals in short-term loans, generally for a period of a year or less. Another common use of the term is as a catchall for all the markets in the financial sector, as per examples in the breakdown below.

The capital markets may also be divided into primary markets and secondary markets. Newly formed (issued) securities are bought or sold in primary markets, such as during initial public offerings. Secondary markets allow investors to buy and sell existing securities. The transactions in primary markets exist between issuers and investors, while secondary market transactions exist among investors.

Liquidity is a crucial aspect of securities that are traded in secondary markets. Liquidity refers to the ease with which a security can be sold without a loss of value. Securities with an active secondary market mean that there are many buyers and sellers at a given point in time. Investors benefit from liquid securities because they can sell their assets whenever they want; an illiquid security may force the seller to get rid of their asset at a large discount.

Financial markets attract funds from investors and channels them to corporations—they thus allow corporations to finance their operations and achieve growth. Money markets allow firms to borrow funds on a short-term basis, while capital markets allow corporations to gain long-term funding to support expansion (known as maturity transformation).

Without financial markets, borrowers would have difficulty finding lenders themselves. Intermediaries such as banks, Investment Banks, and Boutique Investment Banks can help in this process. Banks take deposits from those who have money to save on the form of savings a/c. They can then lend money from this pool of deposited money to those who seek to borrow. Banks popularly lend money in the form of loans and mortgages.