The computer, believe it or not, has an internal memory that doesn't only keep everything you want it to, but deep down inside has records of EVERYTHING and ANYTHING you did on that computer. The only way you can permanently delete something completely off of the computer's memory is to use specific software or take the whole thing apart and clear its brain.
RAM
a section of ram where the computer stores copied data
A computer.
The CPU
Hardware
It stores the data that's on your computer.
The server.
It uses hardware.
Yes, wipe out browsing history. clear dns cache.
A database management system. (DBMS).
binary
It accepts input, processes data, stores data, and produces output.