Okay kiddo, so imagine you are building a fort to protect your toys from invaders. You want to make sure that no one is able to get inside and take your toys away, right? Well, the Sassanians, who were people who lived a loooong time ago, also wanted to protect their land and people from invaders.
They built defense lines, which were like big walls or barriers, to keep the bad guys out. These defense lines were made up of different things like forts, walls, towers, and even moats. Think of them like different layers of protection around your fort of toys.
The Sassanians built these defense lines along the borders of their empire, which was a really big piece of land. They wanted to make sure that no one was able to attack from the outside and take their land away.
Now, if an enemy did manage to break through one defense line, they would still have to deal with the next one, and then the next one after that. It would be like trying to get through all the different layers of your fort of toys.
So that, my dear, is what Sassanian defense lines were all about. They were big walls and barriers made to protect the people and land from invaders, and they were built around the borders of their empire to keep any bad guys out!