Basic Tools allows selection of Hand tool, Snapshot Tool and Select Text Tool

Zoom Tools allows you to increase or decrease the zoom percentage, click the snap shot to copy the displayed area to the clipboard etc..

Edit Content tool allows for editing base content within PDF

Comment and markup contains the tools necessary to mark up, comment on or annotate PDF pages

Measuring Tools contains the tools to allows measure the distance, area and set scale between points and segments

Link Tool allows you to create a link in the same document or websites.