This document provides an overview of trade unions, including their definition, features, objectives, and functions. It defines a trade union as a combination of workers formed to regulate relations between workers and employers, impose conditions on businesses, and includes federations of multiple unions. The key objectives of unions are to improve workers' economic conditions through better wages and benefits, working conditions, job security, and participation in management. Unions serve militant functions like collective bargaining and industrial action, as well as fraternal functions like member welfare, education, and recreational activities.