Tally.ERP 9 is accounting software used by small and medium businesses. It allows for creating different security levels and controls for company data. The document discusses how to enable security controls for a company by creating an administrator login in the company creation process. It also describes how to create new security levels and disable security controls by altering company information settings. Tally.ERP 9 provides features like speed, power, flexibility and real-time processing to help businesses manage their accounting, inventory, and other operations.