PSD is a file format used by Adobe Photoshop for storing images with multiple layers. It allows for detailed editing and manipulation of image elements. PSD files can be easily modified, making them a popular choice for graphic designers and digital artists. They can be saved in other formats like JPG or PNG 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.