1) Tally ERP 9 is an accounting software that integrates various business operations like sales, finance, purchasing, inventory, and manufacturing.
2) The different versions of Tally have added new features over time, with versions adding online functionality, import/export, VAT, payroll systems, and remote access.
3) In Tally, transactions are recorded using vouchers with different voucher types for receipts, payments, purchases, sales, internal transactions, and adjustments.