IWORK is a suite of productivity applications developed by Apple. It includes Pages, Numbers, and Keynote, which are used for word processing, spreadsheets, and presentations, respectively. IWORK files are compatible with macOS and iOS devices and can be exported to other formats like PDF or Microsoft Office files for sharing.
PDF is a widely used file format for documents that need to maintain their original formatting across different devices. It can store text, images, and interactive elements like hyperlinks or forms. PDF files are commonly used for contracts, brochures, and professional reports.