The PDF Editor Mac is a productivity software that allows users to add annotations to their PDF files. While the PDF file format is known for its inability to be edited, this program provides a solution for those who need to make annotations. With PDF Editor Mac, users can add lines, text, and annotations to their PDF documents. The program also offers a pencil and brush tool for more precise annotations. Additionally, users have the ability to rotate their PDFs. However, it's important to note that PDF Editor Mac is primarily focused on annotation capabilities and lacks more advanced editing features. If you only require basic annotation functionality, this software can be a suitable option.