A capital market is a financial market in which long-term debt (over a year) or equity-backed securities are bought and sold. Capital markets channel the wealth of savers to those who can put it to long-term productive use, such as companies or governments making long-term investments.
"Capital Markets" refers to activities that gather funds from some entities and make them available to other entities needing funds. The core function of such a market is to improve the efficiency of transactions so that each individual entity doesn't need to do search and analysis, create legal agreements, and complete funds transfer.