Answer:
A union is a formal group that consists of individuals in a same field or similar professions that are united for their common interests and for protection.
The idea is that a union is more effective than seperate individuals when it comes to Organizational and institutional matters.
So we can say that the main function of unions is to promote the interest of its members and to make certain that the voice of its members is heard in matters where the individuals cannot work separately and alone.
Explanation:
