A File Viewer is a software application that allows users to open and view files without needing to edit them. It supports various file formats, such as documents, images, and videos, enabling users to quickly access content. Common examples include text viewers for reading documents and image viewers for displaying pictures. File viewers are often lightweight and user-friendly, making them ideal for quickly checking file contents. They can be standalone applications or integrated into operating systems like Windows or macOS. Many file viewers also offer basic features like zooming, rotating, or searching within the file for enhanced usability.