April 1 is an informal holiday known as April Fools' Day! People celebrate by playing jokes and trying to trick people in funny and harmless ways. You might be wondering about this word "fool" - how is it used in English? I'll teach you all about it in today's lesson. Don't be fooled by confusing English words! There are a lot of them, and they can be very tricky to understand and use correctly. You can get clear explanations and examples inside my e-book, 600+ Confusing English Words Explained. It will help you understand the differences between similar words like farther and further, interfere and intervene, sensible and sensitive, and many more words with which English learners often make mistakes.