You could say it's the study of stuff, its properties, how to make more of it, and what happens if we mix it with something else.
Chemistry has a great impact on our lives.
Almost everything we eat, wear, use or live in has been made, or at least modified, by chemical processes designed by man. Of course, we have to be careful with those processes. They could cause negative effects on our lives. Because chemistry provides us with powerful tools with which to understand and manipulate the physical world around us, the demand for trained chemist is, and always will be, extensive. Everything from progress in medicine and industry to environmental protection and solving energy problems will require chemistry skill, and companies and governments pay well for solutions and answers.