Kya hai Offer aur Invitation mein Farq?

Yaar, main samajh nahi aaya. Kya offer aur invitation mein kya farq hai? English mein to sab kuch alag-alag hai, lekin concepts mein to sab kuch ekdum jada saman hai.

Maine suna hai ki offer ek proposition hai jo accept ke liye taiyar hai, lekin invitation ek proposition hai jo accept ke liye taiyar hai (ya fir rejected ho sakta hai). Lekin agar invitation ko reject kiya jaata hai toh kya usse offer kahenge ya nahi?

Maine socha aur research kiya hai, lekin abhi tak clear nahi hua. Kuch log keh rahe they ki invitation offer ke equivalent hain, kuch log keh rahe they ki offer different hai. Koi bhi help kar sakta hai please?