A trading system wraps trading formulas into automated order and execution systems. Advanced computer modelling techniques, combined with electronic access to world market data and information, enable traders using a trading system to have a unique market vantage point. Traders, investment firms and fund managers use a trading system to help make wiser investment decisions and help eliminate the emotional aspect of trading. A trading system can automate all or part of your investment portfolio. Computer trading models can be adjusted for either conservative or aggressive trading styles.

A trading system is governed by a set of rules that do not deviate based on anything other than market action. Emotional bias is eliminated because the systems operate within the parameters known by the trader. The parameters can be trusted based on historical analysis and real world market studies, so that the trader who is familiar with the trading system and its operating characteristics can have confidence in a pre-determined trading strategy.

There are programming languages and trading system development platforms that allow on to create their own custom systems.