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What is a negotiable security and how are they related to derivatives?
As Dheer pointed out, Wikipedia has a good definition of what a negotiable instrument is.  A security is an instrument or certificate that signifies an ownership interest in something tangible. 1 share of IBM represents some small fraction of a company. You always have the ability to choose a price you are willing to pay -- which may or may not be the price that you get. A derivative is a level of abstraction linked by a contract to a security... if you purchase a "Put" contract on IBM stock, you have a contractural right to sell IBM shares at a specific price on a specific date. When you "own" a derivative, you own a contract -- not the actual security.