The PDF (Portable Document Format) is a file format created by Adobe in 1995, designed to preserve the layout, colors, fonts, and hyperlinks of a document regardless of the software or operating system used. It is widely used for distributing business documents, reports, and marketing content, particularly in B2B contexts. This format generally requires a specific reader such as Acrobat Reader, often integrated into web browsers. PDF also helps secure documents by preventing modification, while playing an important role in accessibility, user experience, search engine optimization (SEO), and regulatory compliance on the web.