Apple Notes is a note-taking application developed by Apple Inc. that is available on all Apple devices running iOS, iPadOS, and macOS operating systems. The application allows users to create and organize notes that can include text, images, sketches, audio recordings, and even checklists. Apple Notes also includes a search function, collaboration features, and the ability to sync across all devices using iCloud. With its user-friendly interface and robust set of features, Apple Notes has become a popular choice for both personal and professional use.