Adobe PDF is a file format created by Adobe Systems that allows documents to be shared and viewed consistently across different devices and platforms. PDF stands for "Portable Document Format," and it preserves the formatting of the original document, including text, images, and layout, making it ideal for sharing professional documents. One of the key features of Adobe PDF is its ability to be password-protected and encrypted, ensuring that sensitive information remains secure. Additionally, PDFs can be easily annotated and filled out, making them useful for forms and collaborative projects. This versatility has made Adobe PDF a standard format for digital documents worldwide.