Add-On (Defined)
The products Essentials and Premier include a lot of features "in-the-box". However, there are some features that are above and beyond that can optionally be purchased as part of what we refer to as an "add-on" that integrates and significantly enhances the base product.
Add-on's are purchased separately from the base product and, for the most part, can be turned on or off at "any" time depending on the purchase agreement and restrictions for each individual add-on.
Additional Information
See
OptionPack.