Explain what is April Fools' Day?
- In the Western history, April Fools’ Day occurs on April 1 every year. It has been celebrated for more than 400 years
- The exact origins of the Day remains a mystery, though many historians attribute the origin of April Fool's Day to medieval festivals during spring
- The traditions of the Day include playing pranks on others or telling audience jokes followed by yelling "April Fools" at the end to reveal to the audience that they were tricked
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
----------------

----------------
Answer the following query.
Explain what is April Fools' Day?

user
- In the Western history, April Fools’ Day occurs on April 1 every year. It has been celebrated for more than 400 years
- The exact origins of the Day remains a mystery, though many historians attribute the origin of April Fool's Day to medieval festivals during spring
- The traditions of the Day include playing pranks on others or telling audience jokes followed by yelling "April Fools" at the end to reveal to the audience that they were tricked
assistant