A non-governmental organization (NGO) is a type of organization that is usually run without government intervention by common citizens of a country. It acts as a non-profitable organization for public welfare. They are usually cooperative in nature. They are devoid of serving any political or particular community purposes. They work for any social awareness, environmental, cultural, health, women rights, educational or legal cause and are purely non-commercial. They mostly raise funds from private firms. NGOs can be global or national.

A global NGO operates globally having any central control or can run independently having region specific aims. National NGOs are small organization that are located only in a particular country and possess transnational operation. The members in NGO can be of two types. The NGO may have salaried members or can be wholly volunteer based. Though they are not controlled by Government body,  there are many NGOs  that depend on Government sectors for donations and raising funds to run the organization. There are various large organizations as well which have budgets of million dollars.
At the time of creation of United Nations(UN) in the year 1945, the name of non-governmental organization was first proposed. At present the United States have near about 1.5 millions NGOs. The NGOs can be classified into two variants. It may be based on orientation and level of operation.

The aim of various NGOs that are based on orientation are:

Charitable Orientation: These type of NGOs mostly deal with the need of poor people. They focus on providing food, shelter medicine and clothing to the poor.

Service Orientation: These type of NGOs design camps based on family planning, education system, health and medical facilities. They spread campaigns and ask the citizens to take part in the programe they design. After that they provide demo and benefits of the plan and its benefits. They also take care whether the participants are following the program and implementing accordingly.

Empowering orientation: These NGOs spread awareness among the poor to make them knowledgeable about the society, environment, political factors and economy that is playing the vital role in their poor livelihood. They are also provided information on how to improve their strength and live a healthier life. The NGOs act as a facility provider for the poor families.

Participatory orientation: The NGOs that operates based on participatory orientation are those that aim to run a self-help campaign. In these the localities form a community by contributing land, materials, cashtools, labor etc to develop a classy community.

The NGOs based on level of operation includes:

Community based organization: These NGOs originates by the initiative taken by people of their own. They mainly focus on education the poor children or helping them become conscious about their constitutional rights. they also help the urban people fight against any misdeeds happened with them.

City-wide organization: Thee NGOs are based on a particular city and work as different groups like business coalition, chamber of commerce, any community association and health group.

National level NGOs: These are country specific NGOs that might tie up with small level NGOs to grow their branches in every corner of the country or might have their own branches. They mostly comprise of various sections that deals with different operations. These NGOs operates on high budget and usually have a lot of contacts that contributes funds and donations to the organization.

International NGOs: These NGOs act globally. Some of them are Save the Children organizations, Ford Foundation. These NGOs play a vital role in funding the local NGOs and various institutions.
Some of the well known NGO types are BINGO, TANGO, GONGO, INGO, TSO, SBO, DONGO.
At present the operation of NGOs are coming into limelight rapidly and people all over the world some way or another is getting associated with various NGOs.