The kernel coverage here at LWN often touches on memory-management topics and, as a result, tends to talk a lot about both pages and folios. As the folio transition in the kernel has moved forward, it has often become difficult to decide which term to use in writing that is meant to be both approachable and technically correct. As this work continues, it will be increasingly common to use "folio" rather than page. This article is intended to be a convenient reference for readers wanting to differentiate the two terms or understand the state of this transition.