Contract vs Covenant: Kyun lagta hai kuch hi differ hai

Yaar samajh nahi aaya, maine socha tha Contract aur Covenant dono hi similar concepts hain, par paper bolta hai ki dono different hain. Maine Contract kaa basic concept samjha tha - ismein do parties hoti hain, ek contract banana chahti hain, aur dusri party iska performance karna hai. Lekin then kaise aaya Covenant - usmein bhi do parties hoti hain, par kuch special conditions hain. Maine dekha hai ki Contract mein do parties ka direct relationship hota hai, par Covenant mein direct relationship nahin hoti, par indirect hoti hai. Kyun lagta hai kuch hi differ hai, par main confuse hue ho. Please help, mera paper kaa future dekh raha hai.