Supports signatures: With this app you can add your signature onto files. This is especially helpful since nowadays many forms that you download from the Internet require you to use it to fill in the blanks. It also lets you submit forms created with fillable form fields.
Good functionality: With Adobe Reader for Mac, you can do more than just view PDF files - you can edit them as well, adding text and placing check marks and initials. Adobe Reader for Mac is an essential application for reading, printing, marking up, and commenting on PDF files.