"Thematic content" refers to the main ideas or topics that a book, movie, or other type of media explores. It is the central message or subject matter that the creator wants to convey to the audience. Full definition
Rated PG - 13 for mature thematic content including family dysfunction, and for some language and smoking. (seattletimes.com)
Rated PG - 13 for disturbing thematic content, violence and terror, and brief strong language. (seattletimes.com)
If you were a start up selling baby monitors, you would examine the list above to find a low difficulty keyword, and then build thematic content on your site around that. (selfstartr.com)