Bailment vs Pledge: What's the Jhagda Here?

Maine Clat UG ka syllabus dekha hai kya, lekin yeh do shabdon ka rahsya mujhe abhi bhi nahi clear hai - waise bhi night study karke mujhe abhi toh sleep aaraam hai hi nahi. Maine socha ki aap sab log bata sakte hain ke kya hai difference in bailment aur pledge. Dono mein kya fark hai exactly? Mere teachers ko bhi nahi pata. Isme koi specific definition hai kya jo hamen saaf karegi? Batao, agar aapne isme difficulty ke saath padhne ka anubhav kiya hai to.