The helots were serfs who delivered half their produce to the Spartan state. The perioeci (people living about) were free landowners within the Spartan domain but not citizens.
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Foreigners were know as the perioeci and they were belonged in the social class between the Spartiates and the Helots. They had a lot of freedom and they had the opportunity to become merchants and trade.
Spartans, who were full citizens who could vote. Perioeci, who are free but not full citizens and could not vote. Helots, the slave class, were owned by Spartans and could not vote (naturally).
Oh honey, the Spartan helots and perioeci outnumbered the aristocrats around the 7th century BCE. Those poor aristocrats couldn't catch a break with the lower classes breathing down their necks. It was a real game of numbers back in the day, and those Spartans had to watch their backs for sure.
Helots were important because they revolted often. The average Spartan citizen had 12 helots to himself. So, the helots outnumbered the Spartans. The helots' large rebellions caused the Spartans to strenghten their army. This constant test of military ability made the Spartan military strong and powerful.
If the helots defeated the Spartans, the Spartans, being defeated, could not do anything to them.