An umbrella school (a 'cover school' in some states) is a private school that enrolls homeschoolers under its umbrella, so a family files and keeps records under the school rather than directly with the state. In a handful of states it's the simplest legal path, and the school may also issue report cards, transcripts, or a diploma. They range from hands-off record-keepers to more involved programs with requirements of their own, so the fit varies. Worth understanding what a given umbrella does and doesn't handle before enrolling.