Hellenistic Greece is a period of history where the people in Greece and the regions around it had a different way of life and culture than before. It started after the time when Alexander the Great became the king and conquered many lands, including Egypt and Persia.
During this time, there were many different people with different cultures living in the same place. They were all influenced by each other, and new ideas and inventions were born. People also became more interested in science, philosophy, art, and learning in general.
This period is also known for its great buildings and artwork, as well as the creation of new cities and ideas about how to govern people. Overall, it was an important time in history where many important developments took place that shaped the world we live in today.