Amanda Knox is a woman who was accused of doing something very bad that she said she didn't do. This happened a long time ago, in 2007, when Amanda was studying in a different country called Italy.
The Italian police thought that Amanda and her boyfriend had hurt another woman and they were put in jail. But Amanda said that she had nothing to do with hurting anyone, and that was why she went to trial.
A trial is like a very serious game, where a judge and some people who don't know you (called a jury) listen to what happened and decide if you are guilty or not. Amanda's trial was very long, and a lot of people watched it and talked about it.
In the end, Amanda was found guilty and was in jail for a very long time. But later, after a few years, the court said that they made a mistake and let Amanda go free because she didn't do the bad thing that they accused her of.
Many people were very happy for Amanda when she was released from jail, but some people still believe that she was guilty. It's kind of like a big puzzle where everyone has their own idea of what happened, but no one can say for sure.