What is the meaning of thin content?

Thin content is content that has little or no value to the user. It lacks quality and resolves nothing for the reader because of irrelevant information.Some of the pages that lie into this classification are pages with duplicate content, automatically generated content, affiliate and scraped content, and doorway pages can be classified as thin content by Google. Thin content rarely qualifies for Google as the best result. As a minimum, Google has to know what your page is about to know if it should display your result to the user.
After Google Panda update Google has gotten smarter and has learned to distinguish between valuable and low-quality content