A market maker is a individual market participant or member firm of an exchange that also buys and sells securities for its own account, at prices it displays in its exchange's trading system, with the primary goal of profiting on the bid-ask spread, which is the amount by which the ask price exceeds the bid price a market asset.
The most common type of market maker is a brokerage house that provides purchase and sale solutions for investors in an effort to keep financial markets liquid.
Market makers are compensated for the risk of holding assets because they may see a decline in the value of a security after it has been purchased from a seller and before it's sold to a buyer.
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