Tally's software is mainly used for vouchers, financial statements, and taxation in many industries, and has specialised packages for retail businesses. More advanced capabilities are found in its ERP package.
Tally Software is developed with a core proprietary engine with a SDK Wrapper. Most of Tally's Interaction Forms and Reports are developed using Tally Definition Language TDL. Customization of Tally Application can be done using this TDL SDK.