Informix is generally considered to be optimized for environments with very low or no database administration, including use as an embedded database.
With the ability to deeply embed Informix in gateways and routers, timeseries support, small footprint, and low administration requirements, Informix is also targeted at Internet-of-Things solutions, where many of the data-handling requirements can be handled with gateways that embed Informix and connect sensors and devices to the internet.