Content made available on the internet by a user who has either created new content or modified or aggregated a pre-existing work before uploading it.  The content may be, but is not limited to, a combination of all or any of: video; photo / image / drawing / painting; music; audio (other than music); text; games (in particular video games); virtual objects.

Sources:

De Woolf and Partners (2013) Study on the application of Directive 2001/29/EC on Copyright and Related Rights in the Information.