What is a paper mill?

A paper mill is an industrial facility where raw materials, such as wood pulp, are processed to produce paper and related products. These mills can vary in size and complexity, ranging from small operations to large, integrated plants that handle everything from pulping to finishing. In addition to producing various grades of paper, some mills also recycle paper products. The term "paper mill" can also refer to unethical practices in academia, where companies produce and sell pre-written academic papers.