PDF/UA stands for Portable Document Format/Universal Accessibility. It is a standard designed to ensure that PDF documents are accessible to people with disabilities. This includes features that support screen readers and other assistive technologies, making it easier for users to navigate and understand the content. The PDF/UA standard includes specific requirements for document structure, such as tagged content and proper reading order. By adhering to these guidelines, creators can produce documents that are usable by everyone, regardless of their abilities, promoting inclusivity in digital communication.