CHM is a compiled help file format used for delivering help documentation. It stores text, images, and other multimedia elements in a single file. CHM files are commonly used in software applications to provide user guides, manuals, and other technical documentation that can be easily accessed by users.
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.