Stocks Trading Basics. Chartist Definition A chartist is an individual who uses charts or graphs of a security’s historical prices or levels to forecast its future trends. Follow along for reviews of the best stock trading apps and may the market forever be in your favor. A lot of software applications are available from brokerage firms and independent vendors claiming varied functions to assist traders. Enter your trade into the app and presto, you own the stock without any commissions or trade fees.