A manual of style is a big book with rules about how to write and how to present information. It is like a teacher who helps you write your homework but for grown-ups who write books, articles, or official documents.
It tells people how to write things so that they are clear, concise, and easy to understand. It tells people how to use punctuation, grammar, and spelling correctly. It also tells people how to format things like the font, headings, and margins.
Think of it like a recipe book for writing. Just like how a recipe has specific instructions, ingredients, and measurements, a manual of style has specific rules, examples, and guidelines for writing different things.
Ultimately, a manual of style helps people communicate effectively and professionally in writing.