When you make an investment you purchase something and wait for the worth tot rise.
With a trade you buy and sell things to make profit.
Investing is also considered as something that keeps on giving you profit passively and that's for doing nothing just like depositing into casino's bankroll or buying a real estate.
Yes trading, is simple as that. You'll buy today and just hold it for a longer or shorter time and when you see you got interest for selling it, that's profit.