Okay, kiddo, so a pele tower is like a tall building made of stone that was built a long time ago in Scotland and northern England.
People used to build them to protect themselves from bad guys who wanted to hurt them. These towers were so strong and tall that even if someone attacked them, they wouldn't be able to break in easily.
Inside the pele tower, there were rooms where the people who lived there could sleep, cook, and eat. They also had windows so they could see what was happening outside without being in danger.
Nowadays, some of these pele towers are still standing and some people even live in them. They're like old and strong castles that just never got destroyed.