Public is the people who make up a community, state, or nation, as in When a government raises taxes, the public has a right to know. A single person in this context is a member of the public. Related to that, public is used to describe many things connected to the public, such as something related to it (public funds), providing a benefit to it (public school), or providing a service (public official).

https://www.dictionary.com/browse/public