Open, browse, and print PDF documents. Highlight text, insert comments and share them, add sticky notes, search for particular words and expressions within a PDF file, zoom pages in or out, use the full-screen mode, etc. Add digital signatures to PDF documents and share them via e-mail.
Adobe Reader is a PDF viewing app for Mac OS X. It allows you to open PDF files, browse them and print them. It doesn't really have any features that allow you to create a PDF file or any content whatsoever. On Windows, Adobe Reader is arguably the most popular PDF reader. For Mac, however, I don't think this is as much popular.
Adobe Reader is a very capable PDF reader. When I first launched it, it asked me if I wanted to set it as the default PDF reader. I appreciated that the app asked about it and didn't change the setting without my approval. When I launched a PDF file I noticed that the app was very fast, certainly faster than its Windows counterpart ever used to be for me. The usual features were all there. You can highlight text, add comments and share them, find text within a PDF file, zoom in or out, enter the full-screen mode and fit a full page in this view, etc. Browsing a PDF file was quite fast.
This is, of course, a free tool and it works well. There couldn't be any harm in trying it out.