We get this question often: What is an Inglenook?

Wikipedia says

“An inglenook (Modern Scots ingleneuk), or chimney corner, is a recess that adjoins a fireplace. The word comes from ingle, meaning “fireplace” in Old English (from Old Scots or Irish aingeal, “angel” or euphemistically “fire”), and nook.”

History

The inglenook originated as a partially enclosed hearth area, appended to a larger room. The hearth was used for cooking, and its enclosing alcove became a natural place for people seeking warmth to gather. With changes in building design, kitchens became separate rooms, while inglenooks were retained in the living space as intimate warming places, subsidiary spaces within larger rooms.

Source: https://en.wikipedia.org/wiki/Inglenook