What do I click on to get to Temporary Files?

I ran into eons of problems with my computer and ran the antivirus stuff and that didn't help. I called on my friend who is a Computer Technician. He found my temporary files and got rid of them. Later, when I went to look up the files and follow suit, I oculdn't find the Temporary Files. My friend got away before I could figure out what he did. I clicked on every icon conceivable and couldn't find "Temporary Files" anywhere.