A Turing Machine $($the basis for our modern computers$)$ is composed of $4$ components: a$($n$)$ infinitely long tape $$ which is split into cells and holds symbols$/$data for calculations; $a(n),$ which reads$/$writes symbols$/$data; $a(n)$ that dictates what$/$when symbols are to be read$/$written; and a$($n$)$ which keeps track of the state of machine.

$\backslash$table$[[$# CPU $($central processing unit$),$vdots instruction counter,$],[$:: infinitely long tape,,$$: writer$]]$