20 January 2016 Last updated at 07:11 GMT
It is all around us, it can be found in our homes, buildings and is used to make car parts, household appliances and even knives and forks.
The UK has a rich history of steel production but over the past few months many British steel workers have been told they might be losing their jobs.
Jenny looks into why the steel industry in the UK is in trouble.
Steel is and important and useful metal.