What is the difference between primary and secondary securities markets?

"Securities markets can be divided into primary and secondary markets. The primary market is where new securities are sold to the public, usually with the help of investment bankers. In the primary market, the issuer of the security gets the proceeds from the transaction. A security is sold in the primary market just once—when the corporation or government first issues it. The Blue Apron IPO is an example of a primary market offering. Later transactions take place in the secondary market, where old (already issued) securities are bought and sold, or traded, among investors. The issuers generally are not involved in these transactions. The vast majority of securities transactions take place in secondary markets, which include broker markets, dealer markets, the over-the-counter market, and the commodities exchanges. You’ll see tombstones, announcements of both primary and secondary stock and bond offerings, in the Wall Street Journal and other newspapers. Two types of investment specialists play key roles in the functioning of the securities markets. Investment bankers help companies raise long-term financing. These firms act as intermediaries, buying securities from corporations and governments and reselling them to the public. This process, called underwriting, is the main activity of the investment banker, which acquires the security for an agreed-upon price and hopes to be able to resell it at a higher price to make a profit. Investment bankers advise clients on the pricing and structure of new securities offerings, as well as on mergers, acquisitions, and other types of financing. Well-known investment banking firms include Goldman Sachs, Morgan Stanley, JP Morgan, Bank of America Merrill Lynch, and Citigroup. A stockbroker is a person who is licensed to buy and sell securities on behalf of clients. Also called account executives, these investment professionals work for brokerage firms and execute the orders customers place for stocks, bonds, mutual funds, and other securities. Investors are wise to seek a broker who understands their investment goals and can help them pursue their objectives. Brokerage firms are paid commissions for executing clients’ transactions. Although brokers can charge whatever they want, most firms have fixed commission schedules for small transactions. These commissions usually depend on the value of the transaction and the number of shares involved."