A Task is an assigned activity that requires action to achieve an outcome. At minimum, a task always includes a Title, Description, Responsible Party, Due Date, and a button that Assigns the task. When the person filling out the task clicks on that button, the status is changed to Scheduled. Other question types can be added as well.
Completed tasks can be found on the All Tasks tab. Once the scheduled work is acted upon, and with proper permissions, the status is typically changed to Pending, Canceled, or Complete.
A Form is an activity that provides requested information in predefined fields. Forms can range from very simple and straightforward, to more complex, involving a Form Flow which is a series of actions to be completed in a sequential manner by different people/roles.
Within a Compliance module, when a form is completed it is called an Event. Those completed forms (events) are located in the All Events tab.