PDF software refers to applications designed to create, edit, view, and manage PDF (Portable Document Format) files. These files are widely used for sharing documents because they preserve the formatting across different devices and platforms. Popular features of PDF software include text editing, annotation, and the ability to convert other file types into PDF. Many PDF software options are available, ranging from free tools to professional-grade applications. Some well-known examples include Adobe Acrobat, Foxit Reader, and Nitro PDF. Users can choose software based on their specific needs, such as simple viewing or advanced editing capabilities.