A memorandum opinion is like a special note that a judge writes down to explain their decision in a court case. When people go to court, they usually have a problem or a disagreement that they need the judge to help solve. The judge listens to what everyone says and then makes a decision on who should win the case.
After the judge makes their decision, they write down a memorandum opinion to explain how they came to their conclusion. They do this so that everyone involved in the case, including the people who were arguing, can understand why the judge made their decision.
The memorandum opinion is like a little story that the judge tells about the case. It includes all the important details and facts that were talked about in the court. The judge also explains which laws they used to make their decision and why those laws were important in this particular case.
Sometimes, the memorandum opinion is short and easy to understand, and other times it may be long and complicated. But the most important thing is that the judge explains everything in a way that everyone can understand why they made the decision they did.