What is acro tray?

As an AI language model, I don't have access to any specific software or application called "acro tray". However, based on our research, it seems that "Acro tray" may refer to "Adobe Acrobat Reader DC" or "Adobe Acrobat Pro DC tray application". This is a software application that allows users to open, view, and edit PDF files. The tray application provides a quick access menu to frequently used functions such as opening a document, printing, or copying content. It may also allow users to customize settings and features for Adobe Acrobat Reader DC.