Shafi'i is a way or method of looking at Islamic religion and its rules. It is named after the person who started this way, Imam Shafi'i.
Imam Shafi'i lived in a part of the world called Arabia a long time ago. He thought a lot about Islam and how people should follow it. He wrote down his thoughts in books that people have been using for many years to help them understand Islam better.
One of the things that makes Shafi'i different from other ways of looking at Islam is that it has a set of rules and guidelines on how to look at things like interpreting the Quran, or deciding what is allowed and what is not allowed in Islam.
These rules are designed to help people follow Islam in a way that is fair, just, and makes sense. For example, in Shafi'i, when you are trying to figure out what is allowed or not allowed in Islam, you have to look at the Quran, the sayings of the Prophet Muhammad (peace be upon him), and the actions of the early Muslims.
In Shafi'i, there are also rules on how to pray, how to fast during Ramadan, how to give to charity, and other parts of Islamic worship. These rules are based on what Imam Shafi'i learned from the Quran and the Prophet's teachings, as well as what he saw other Muslims doing at the time.
Overall, Shafi'i is one way of looking at Islam and its rules, and it has helped many Muslims understand their religion better.