Understanding "Privity of Contract" in Jurisprudence

Koi to hai jo clear kar sakta hai yaar, main to abhi tak confuse hoon. TS LAWCET ke liye jurisprudence se related questions hain. Meri book mein likha hai ki Privity of Contract wala concept kya hai, lekin jo examples hain, voh kai baar hi the same hain. Aisi baat hain ki jo parties hain contracts mein, unke beech hi relationship hoti hai, lekin kya ye koi rule hai ya condition. Main na pata chalta hoon kya main apne exams mein yeh correctly answer kar sakta hoon. Koi to share kare ki clear example hai kya?