An ELS file is a data file created by TradeStation, a stock trading platform used to analyze markets, find opportunities, execute trades, and monitor trades. It contains one or more analysis techniques and strategies configured in the application.

The ELS file is one of the main file types used by TradeStation to save trading strategies and techniques. The software also creates the ELA file (introduced in version 4) to store EasyLanguage archives and the ELD file (introduced in version 6) to store EasyLanguage documents. ELS files are saved in the EasyLanguage Storage (ELS) format and are compatible with TradeStation 2000i and later. You can export an ELS file in TradeStation by selecting File → Import/Export EasyLanguage and select Export EasyLanguage Archive file. You can import an ELS file in TradeStation by selecting File → Import/Export EasyLanguage and select Import EasyLanguage Archive file.