The Kodak Ektachrome E100SW is a slide film. It is the "brother" of the Ektachrome E100S and overlaps with it in many ways.
The "SW" in the name of the Kodak Ektachrome E100SW stands for "saturated warm", so warm images are on the agenda with the Ektachrome E100SW. With the ISO 100 film is therefore also well suited for travel photography where photos with a warm color mood are desired.
Kodak has discontinued the reversal film; just like all films of this type in the meantime. Before that, you could buy the Ektachrome E100SW as medium format, 35mm and sheet film.
