What are the key purposes of government?

establish n uphold the laws

provide essential services to citizens

collect taxes

protect nation from outside forces

The purposes of government will depend on the type of government - a medieval monarchy government may have different purposes from a modern democratic government.

In general, a government will provide security both internal law and order among its citizens and protection from external threats. It will take on municipal services for its citizens. It will provide a stable living environment and ensure continuation of the government itself.