What was the purpose of the delian league?

QUESTION: What was the purpose of the Delian language

It sent Athenian colonists to settle other city-states, collected taxes, and used the shared navy for itself. In 454 BC, Pericles moved the treasury from Delos to Athens, allegedly to protect it from Persia. Effectively, it turned the Delian League into the Athenian Empire.

The purpose was to continue fighting the Persian Empire after the Greek victory in the Battle of Plataea at the end of the Second Persian invasion of Greece.

C: it lets citizens decide which leader's will represent them