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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.
ICO is an image file format used for storing icons in Windows operating systems. ICO files can contain multiple sizes and color depths of the same icon, allowing the system to choose the appropriate version based on the display resolution. ICO files are commonly used for website favicons and desktop application icons.