Contract of Indemnity vs. Guarantee: Kya hai difference?

Main ekdum confuse ho gaya hoon yaar, koi bhi madad karega? Mere pas yehi samajh nahi aati hai. Mere college ka exam 2 mahine mein hai aur mera contract law mein ek question aane ki sambhavana hai, lekin main samajh nahi paya hai. Kya contract of indemnity ke liye guarantee ek alternative hai? Ya phir kuchh hi alag. Mera book mein yeh likha hai ki guarantee ek type of promise hai jo aadhaara par nirbhar karti hai, jabki indemnity ka base koi nahi. Toh kya guarantee ke base par contract of indemnity bhi bana sakte hain? Agar hain toh kaha hai? Pls help!