Interpellation is a big word that means when somebody calls your name and you answer. When someone calls your name, you know that they are talking to you and in a way, you become that name they called.
Let's say your name is Sarah - when your mom calls your name, you know she is talking to you, and you become Sarah in that moment.
Interpellation happens to you every day. When someone calls you by your name or uses titles like "student" or "son", they are talking to you specifically and you respond to that.
But in philosophy, interpellation means something a little different. It is when society or other people tell you who you are and what you should do, and you start to believe them.
For example, let's say society tells you that boys should like blue and girls should like pink. If you believe that and start to like pink just because you are a girl, then it means that you have been interpellated by society. Society has told you who you are and you have started to believe it.
Interpellation can be good or bad - sometimes it can help us understand ourselves better, and sometimes it can limit us and make us believe things that aren't true. So it's important to think for ourselves and not always believe what others tell us.