In ancient Greece, there were some people who owned other people. These people who were owned were called slaves. The owners were usually rich people who could afford to buy and keep slaves.
Slaves in ancient Greece had to work very hard and were not allowed to have any say in their lives. They had to do whatever their owners told them to do. They worked on farms, in households, and in mines.
Slaves had no rights and were not considered citizens of Greece. They were not allowed to vote in elections or go to the market without the permission of their owners.
Slavery was a normal part of life in ancient Greece, but some people did not agree with it. There were philosophers like Plato and Aristotle who thought that slavery was wrong. However, their ideas did not change the fact that slavery continued in Greece for hundreds of years.
Eventually, slavery was abolished in Greece, but it took a long time for people to realize that everyone should be treated equally, no matter what their background is.