Contract v/s Covenant - Kya difference hai?

Yaar samajh nahi aaya, please help me out. In Contract Law, main confuse ho raha hoon contract aur covenant ke beech ki difference se. Dono hi ek type ki agreement hote hain, phir bhi unme kuch aisa hai jo mujhe confused karta hai.

Mujhe lagta hai contract main ek agreement hota hai jisme doston ya organizations ki koi promise hote hain. Lekin covenants ke bare mein kuch samajh nahi aaya. Kya covenants bhi ek type of agreement hain jaise contract? Ya phir woh kuch alag cheez hai?

Section 2(h) of the Contract Act 1872 kaha hai ki contract koi agreement hai jisme doston ki promise hote hain.