A document format refers to the specific way in which information is organized and stored in a file. Common document formats include PDF, DOCX, and TXT. Each format has its own set of rules for how text, images, and other elements are displayed, making it easier for users to create, share, and view documents across different devices and software. Different document formats serve various purposes. For example, PDF is often used for sharing documents that need to maintain their layout, while DOCX is commonly used for editable text documents in Microsoft Word. Understanding these formats helps users choose the right one for their needs.