A trade union is an organization consisting of employees, employers, or independent workers acting together to safeguard and advance their shared interests via collective bargaining. It is an organization dedicated to securing economic advantages for its members. It was created for several purposes. Individual workers deemed it more beneficial to unite and endeavour to set their working terms and conditions. They recognized that negotiating as individuals would provide the employer greater influence, as each individual has less significance than a collective in the operation of the enterprise. . Trade unions are regarded as fundamentally reforming organizations and economic institutions that were grounded on the Sarvodaya ideals of Truth, nonviolence, and Trusteeship. Trade unions are significant entities in the contemporary industrialized landscape. Trade unions adhere to three fundamental principles: Unity is strength, Equal remuneration for equivalent effort, and Employment security. In India, trade unions are intricately connected to industrial relations. . This paper is an attempt to analyze the perception of employees towards trade unions in promoting industrial relations in Tamil Nadu State Transport Corporation (TNSTC), Tirunelveli Division