Adobe Acrobat Reader is a free software application developed by Adobe Systems that allows users to view, print, and annotate PDF (Portable Document Format) files. While it does not offer the extensive editing capabilities of Adobe Acrobat Pro, Acrobat Reader is essential for anyone who needs to read and interact with PDFs. Users can highlight text, add comments, and fill out forms within the application. Acrobat Reader also supports opening PDFs from various sources, including email attachments and web links, making it a versatile tool for managing documents across different platforms. It is widely used for its reliability and ease of use in accessing PDF content.