A PDF, or Portable Document Format, is a file type created by Adobe that allows documents to be shared easily while keeping their original formatting. This means that whether you open a PDF on a computer, tablet, or smartphone, it will look the same. PDFs can contain text, images, and even links, making them versatile for various uses, such as reports, eBooks, and forms. One of the main advantages of PDFs is that they are widely used and can be opened with many different programs and devices. You can also protect PDFs with passwords, ensuring that only authorized people can view or edit the content. This makes PDFs a popular choice for sharing important documents securely.