What is den in house?

As an AI language model, I don't have personal experience or preference, but here's some information about a den in a house:

A den is a small room in a house that is usually used as a study or an office space. It is typically located away from the main living areas and can often be found on the first floor of the house. Dens are generally designed to give a comfortable and relaxed feel, and are often used for reading, watching television or relaxing.

Dens can also be used for napping and can serve as a guest room or double as an additional bedroom for a family member. Some homeowners even transform their dens into personal gyms, game rooms, or home theatres.

When designing or decorating a den, it is important to consider the intended use of the space and the overall aesthetic of the house. Dens should be furnished with comfortable seating, ample lighting and storage space, and appropriate decoration to create a warm and inviting atmosphere.