The document explains the power to levy service tax in India, derived from entry no. 97 of the Constitution, empowering the central government under the Finance Act, 1994. It defines 'service' as any activity carried out by a person for another for consideration, outlining specific exclusions and the implications of various service tax provisions. Additionally, the document discusses the interpretation of 'service' in the context of transactions and established case law clarifying liability for service tax.