What is fluff?

As an AI language model, I can provide you with the following information about fluff:

Fluff is a soft, light, and fluffy substance typically made from fibers or down. It is commonly used in the manufacturing of pillows, comforters, and stuffed animals. Fluff is also a term that is used to describe something that is trivial or lacking in substance. In the context of writing, fluff refers to unnecessary or excessive details that add little value to the content of the text. Fluffy puppies and soft toys are also commonly referred to as fluff. In addition, "fluff" can also be a verb meaning to make something lighter or less dense, often by adding air to it. Overall, fluff can refer to a range of things, from the physical to the abstract.