Titles can be deceiving and still be true.
Let's start with a definition from Wikipedia.
Sump Pump: A sump pump is a pump used to remove water that has accumulated in a sump pit. A sump pit, commonly found in the home basement, is simply a hole to collect water. The water may enter via the perimeter drains of a basement waterproofing system, funneling into the pit, or may arrive because of rain or because of natural ground water, if the basement is below the water table level. In some cases, a sump pump is used when a lower floor is below the municipal sewer lines, to pump greywater or blackwater waste from that floor to the sewer lines.
Our sump pump is used for the latter case, to pump greywater and blackwater waste from the basement up to our septic lines.
What might our home smell like if the sump pump stopped working . . . an outhouse, on a warm summer day.
How might I know that answer? Experience.