Social security code definitions clarify coverage for employees, employers, establishments, wages, gig and platform workers. The Code defines core terms determining coverage and obligations: employee, with chapter-specific wage-ceiling provisos; employer and establishment to fix responsibility and scope; wages with specified inclusions, exclusions and aggregation rules; distinct worker categories (contract, fixed-term, gig, platform, home-based, self-employed, unorganised, inter-State migrant) for scheme eligibility; and institutional and scheme definitions (Central Board, Corporation, Provident Fund, Pension Fund, Insurance Fund, Social Security Organisation) necessary for administration and enforcement.