A trade union (British English—amalgamation is also used), labour union (Canadian English) or labor union (American English) is an organization of workers who have banded together to achieve common goals such as protecting the integrity of its trade, achieving higher pay, increasing the number of employees an employer hires, and better working conditions. The trade union, through its leadership, bargains with the employer on behalf of union members (rank and file members) and negotiates labour contracts (collective bargaining) with employers.The most common purpose of these associations or unions is "maintaining or improving the conditions of their employment".

This may include the negotiation of wages, work rules, complaint procedures, rules governing hiring, firing and promotion of workers, benefits, workplace safety and policies. The agreements negotiated by a union are binding on the rank and file members and the employer and in some cases on other non-member workers.Trade unions traditionally have a constitution which details the governance of their bargaining unit and also have governance at various levels of government depending on the industry that binds them legally to their negotiations and functioning. Originating in Europe, trade unions became popular in many countries during the Industrial Revolution, when the lack of skill necessary to perform most jobs shifted employment bargaining power almost completely to the employers' side, causing many workers to be mistreated and underpaid.Trade unions may be composed of individual workers, professionals, past workers, students, apprenticesand/or the unemployed.

Over the last three hundred years, trade unions have developed into a number of forms. Aside from collective bargaining, activities vary, but may include:* Provision of benefits to members: Early trade unions, like Friendly Societies, often provided a range of benefits to insure members against unemployment, ill health, old age and funeral expenses.In many developed countries, these functions have been assumed by the state; however, the provision of professional training, legal advice and representation for members is still an important benefit of trade union membership.* Protection of workers: Unions prevent exploitation of workers, increase their wages thereby reducing inequality.

[2]* Industrial action: trade unions may enforce strikes or resistance to lockouts in furtherance of particular goals.* Political activity: trade unions may promote legislation favourable to the interests of their members or workers as a whole.To this end they may pursue campaigns, undertake lobbying, or financially support individual candidates or parties (such as the Labour Party in Britain) for public office. In some countries (e.

g. , the Nordic countries and the Philippines), trade unions may be invited to participate in government hearings about educational or other labour market reforms. The origins of unions' existence can be traced from the 18th century, where the rapid expansion of industrial society drew women, children, rural workers, and immigrants to the work force in numbers and in new roles.This pool of unskilled and semi-skilled labour spontaneously organized in fits and starts throughout its beginnings,[1] and would later be an important arena for the development of trade unions. Trade unions as such were endorsed by the Catholic Church towards the end of the 19th century.

Pope Leo XIII in his "Magna Carta"—Rerum Novarum—spoke against the atrocities workers faced and demanded that workers should be granted certain rights and safety regulations. Industries like textile mills and railways companies had started in India in the latter half of the 19th century.