What is a period/era?

Explanation:

An era is a span of time defined for the purposes of chronology or historiography, as in the regnal eras in the history of a given monarchy, a calendar era used for a given calendar, or the geological eras defined for the history of Earth. Comparable terms are epoch, age, period, saeculum, aeon and Sanskrit yuga.

a period of time considered as being of a distinctive character; epoch. an extended period of time the years of which are numbered from a fixed point or eventthe Christian era.

political parties perform an important task in government. they bring people together to achieve control of the government, develop policies favorable to their interests or the groups that support them, and organize and persuade voters to elect their candidates to office.

explanation: