Table:
| (dollars in millions) | 2019 | 2018 | 2017 | % Change 2019 - 2018 |
| --- | --- | --- | --- | --- |
| Digital Media | $7,208.3 | $5,857.7 | $4,480.8 | 23% |
| Digital Experience | 2,670.7 | 1,949.3 | 1,552.5 | 37% |
| Publishing | 115.5 | 115.2 | 100.6 | * |
| Total subscription revenue | $9,994.5 | $7,922.2 | $6,133.9 | 26% |
Paragraphs:
Subscription Revenue by Segment
Our subscription revenue is comprised primarily of fees we charge for our subscription and hosted service offerings including Creative Cloud and certain of our Digital Experience and Document Cloud services. We recognize subscription revenue ratably over the term of agreements with our customers, beginning with commencement of service.
We have the following reportable segments: Digital Media, Digital Experience and Publishing. Subscription revenue by reportable segment for fiscal 2019, 2018 and 2017 is as follows:
(*) Percentage is less than 1%
Our product revenue is primarily comprised of revenue from distinct on-premise software licenses recognized at a point in time and certain of our OEM and royalty agreements. Our services and support revenue is comprised of consulting, training and maintenance and support, primarily related to the licensing of our enterprise offerings and the sale of our hosted Digital Experience services. Our support revenue also includes technical support and developer support to partners and developer organizations related to our desktop products. Our maintenance and support offerings, which entitle customers to receive desktop product upgrades and enhancements or technical support, depending on the offering, are generally recognized ratably over the term of the arrangement.
Question:
What does their subscription revenue mainly comprise of?
Answer: fees we charge for our subscription and hosted service offerings including Creative Cloud and certain of our Digital Experience and Document Cloud services