A Reminder Task shows the contact's information, the subject of the reminder, and the reminder notes.
A Reminder Task can say anything. It could be a reminder to connect with the contact through social media, or a reminder to call someone. For example, if you called someone in August and they told you this quarter isn't a good time, and to check back in November, then you could create a reminder for them scheduled in November. When you come across the task in November, you can place a call right from the reminder task.
Here's an example of a reminder preview:
There are eight buttons on the bottom of the preview: