Working in partnership within the global science and health communities, the company publishes more than 1,800 journals and 2,200 new books per year, in addition to offering a suite of innovative electronic products, such as ScienceDirect and MDConsult. MDConsult, bibliographic databases, online reference works and subject specific portals
The biggest name in academic and research publication companies. They publish original and peer reviewed scientific and management/business publications, and went into electronic publishing of these very early. Also secondary publishing/databasing etc.
Their products and services are very expensive and mainly targeted to industry, not consumers - e.g. academic and research libraries, corporate libraries and knowledge bases. So their pricing assumes that a lot of people will read the one copy.
I would guess (but not sure) they are mainly interested in original research-based and content information, backed by research studies and academic qualified researchers.
Researchers and scientists use their products to do secondary research on what research has been done on their topic before.