An industrial engineer is someone who organizes people, places, equipment, and information. You make sure everything is running smothly and safely. They also deal with operations and many systems. They, like all engineers, solve problems.
Some of the projects an industrial engineer might do is figure out how to make lines shorter at an amusement park, design an admisions process for a hospital, or design a whole clothing store in a computer simulation.
The reason I choose this engineering feild is because it seems the most fun. You get to experiment with things and solve problems. I also like organizing things and this sounds like a job where you do that. I also find this interesting because I have never heard about it before.