Definition & Meaning of "packrat"in English

What is the origin of the term "packrat" and how is it used?

"Packrat" is a slang term that appeared in English in the early 20th century, using the image of a rat that collects and stores items to describe a person who compulsively saves and accumulates unnecessary things. The metaphor emphasizes hoarding behavior and attachment to possessions. It is used in informal, often descriptive or mildly teasing contexts, including conversation, media, and psychology discussions. The term is mildly derogatory but usually more observational than harsh; its offensiveness depends on tone and context.