The capital market allows investors with surplus funds to provide capital to those with deficits. It trades various financial instruments like bonds, equities and mortgages. There are two main segments: the primary market where new securities are issued for the first time, and the secondary market where previously issued securities are traded to provide liquidity to investors. The capital market helps raise long-term funds for business expansion and new ventures through public offerings, rights issues, and private placements in the primary market, and through stock exchanges in the secondary market.