Difference Between Private Company and Limited Company in India

Kya hai sahi jaankari? Main aaj tak suna tha ki Private Company aur Limited Company sabse badi difference private company ke share capital ka limit hota hai, 200 lakhs. Lekin kuch aur books mein likha hai ki inmein Private Company ka koi limit nahi hai, to phir yeh Private Company kaise Limited Company se alag hai? Aur koi aur baat hai jo maina pasand ki hai, agar koi Private Company ko public company me convert karta hai, to kya public issue ki anumati lagne se pehle 25% mein share aapnaane wale investors ka ek list banaya jaata hai ya nahi?

Please someone explain, main confuse ho gaya hu, koi example bhi de sake.