Question

what is difference between screw and stud

Answer 1

$\textbf{SCREW}$
An externally threaded fastner capable of being inserted into the holes inside assembled parts (now comes the difference) of mating with a pre formed internal thread or forming it's own thread is called a screw. It has an ability of being tightened and released by torquing the head.


$\textbf{Stud}$
A metal rod or shaft with threads on both sides is called a stud. Usually the rod is long, but depending upon the requirement the size can be changed. Given below is an image of a stud
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Answer 2

a studs aresmall pieces of metal which are attached to a surface for decoration

a screw is a metal object similar to an email with arranged spiral line around it