What is backtesting in trading?

Backtesting is the most common way to examine how well a trading strategy or model would have performed ex-post. Backtesting examines how a trading strategy would perform over time by using previous data to forecast its outcome. Traders and analysts may have confidence in it if backtesting succeeds.

When Forex strategies backtesting software is done, traders and analysts can confidently use them going forward. The application then calculates the profit and loss because of the execution of the strategy. The application then analyzes how these transactions would have impacted a trader's portfolio if it had been invested in the strategy during the period used for backtesting.