In commodity it includes crude oil, gold, steel, iron, Etc. This items are more profitable. A security too has a monetary value & it is not traded between just two parties.
You will also earn with insurance by investing the amount in various policies such as in Bank, Post Office, LIC, Etc.
Why Is Investment Important?
Investment is very necessary for your future, you will be able to use the money for future needs. If your income is not generated from anything, then the invested amount is useful in starting your own business or any other work.