Government is the organization of people and institutions that provide goods and services to citizens and protect them from outside interference. It also maintains public safety, provides a means of communication between citizens and their representatives, and allows citizens to participate in government through elections and other activities.

Government can have many different styles and forms, including dictatorship (government by one person or small group), empire (established by conquering), feudalism (orderly pyramid of control), communism (each according to their ability), and democracy (rule by the people). The United States is a democratic republic with a Constitution, which guarantees citizens rights and freedoms.

The main responsibility of the government is to provide goods and services that individuals cannot provide on their own, such as public schools, roads, fire departments, police forces, health care, and social programs. To finance these services, governments collect taxes and fees or borrow money from the public by selling bonds.

Another important role of the government is to protect goods that all people can use without paying for them, such as fish in the sea or clean drinking water. These goods are called common goods and must be protected from people who take too much or who leave too little for others.

In this way, the government prevents free-rider problems and ensures that everyone has enough to eat, drink, and live. It also protects the environment from pollution and other damage.

Some of these public goods, such as air and water, are in limited supply and must be regulated for their protection. Moreover, the government must keep the population from over-consuming natural resources and using them up before there is a need for them again.

The government is responsible for maintaining the national defense and protecting its citizens from terrorism, war, and other threats of violence. It can do this through the army, police force, and other public safety agencies.

Aside from ensuring that the military is properly equipped, trained, and well-funded, the government also oversees law enforcement. It is also the organization that responds to disasters and emergencies and regulates immigration.

Managing externalities, social inequality, and market failures is another critical role of the government. To do this, the government often makes regulations to ensure that businesses and other entities comply with these rules.

This requires a great deal of research, which is why most governments rely on experts to develop their policies and regulations. This research also helps to ensure that the decisions made by the government are in the best interests of the nation.

To determine the most effective ways to manage public spending and revenues, governments must consider both short-term and long-term goals. They must also be able to measure how well their policies are working and what adjustments are needed.

Currently, most countries have a budget that they negotiate every legislative period. This budget shows how much revenue and expenditure the government expects to gain during the year and the investments it plans to make. It also outlines the deficit and the savings it plans to achieve.