Trade unions are organizations formed by workers to protect their interests and achieve better working conditions through collective bargaining with employers. The main functions of trade unions are to represent workers, negotiate on their behalf, and give workers a voice in decisions that affect them. Trade unions also provide services to their members like training, welfare benefits, and help resolving issues. Workers join trade unions for greater bargaining power with employers, to reduce discrimination, and have a sense of security, participation, and belongingness. Unions are classified based on their ideology, the industries and trades they represent, and the types of agreements they have with employers regarding membership.