Difference btwn Consideration & Privity of Contract

Hey guys, koi bata do mujhe yeh confuse kar raha hai. Main to 3vi baar paper de rahe hoon, aur mere paas abhi bhi samajh nahin aayi. Main samajhta hoon ki consideration aur privity of contract dono hi contract ke rules se relate hote hain, par dono mein kya fark hai exactly? Kya yeh dono hi same hai ya ek dusre se alag? Privity of contract kya hai? Kya yeh consideration se related hai? Koi example bata do jisse mujhe samjh pade.