A picture of an steam engine well made.
A steam engine is a heat engine that performs mechanical work using steam as its working fluid.
An steam engine it was developed by Thomas Savery had been working on solving the problem of pumping water out of coal mines, his machine consisted of a closed vessel filled with water into which steam under pressure was introduced.
This invention make life different because they could used for transportation and so it could carry heavy stuff, even now those steam engines would work but those are even better and they don't use the steam to work or move.
One problem that it helped with is that back then, it was hard for people to make more because they did not have much technology like we do now. The steam engines can make a problem now because they don't use water as a resource of moving they actually use diesel or some other type of flammable chemical.