Bail vs Pledge: Kya Fark Hai?

Maine socha hai ab toh clear karenge. Maine 3 mahine se lekar, abhi tak confuse hoon ki Bail aur Pledge mein kya difference hai. Bilkul pata nahin. Toh aap sabhi, help ke liye aaj raat 2 baje aapko call kar raha hoon. Koi bhi, explain karega. Meri confusion: kya difference hai ki jab koi property kisi ko loan pradan karta hai, toh usse pledge kehte hain, aur kya jab woh apne property ko police ke samne rakhta hai, toh usse bail kehte hain. Aur kya kya hain? Kisi ne to mujhe yeh difference batani chahiye. Help, please!