• Doctors make people well
• Electrical engineers work with electricity
• Teachers teach
• Civil engineers build roads and bridges
• Firemen put out fires

Here's the best suggestion Institute of Industrial Engineers has heard:

People always ask "What is Industrial Engineering?" And to that question there is no real reply, we are found everywhere, doing everything. Industrial Engineering is about "process engineering" rather than "product engineering" which gives up a difficult job description. The best answer is the simplest one... Industrial Engineers make systems productive.