Final answer:
The Hellenistic Era was a period after the Classical Age when Greek civilization spread across the Middle East. It lasted for about three hundred years and saw achievements in exploration, literature, and knowledge of the world.
Step-by-step explanation:
The Hellenistic Era refers to the period after the Classical Age in ancient Greece, when Greek civilization spread across the Middle East. This era began with Alexander the Great's conquest of the Persian Empire and lasted for about three hundred years before the Romans conquered the Hellenistic kingdoms. During this time, there were significant achievements in various fields, including exploration, literature, and knowledge of the world.