Hello, Ashish!
"Мою" - my, mine - Used to express that something belongs to you.
"Твою" - your, your's - Used to express that something belongs to the person you are talking to.
"Нашу" - our, our's - Used to express that something belongs to a group of persons which you represent
"Вашу"- your, your's - Used to express that something belongs to a group of persons to a repesentative of which you are talking to.
"Вашу" - can also be used as a polite form of "Твою", when you are talking to a person you don't know closely.
"Мою, Твою, Нашу, Вашу" are the forms of pronouns "Моя, Твоя, Наша, Ваша" in Accusative (one of 6 russian grammar cases). If you are speaking Russian, you should use nouns and pronouns in Accusative in phrases like "I see (something)". It is hard to explain, because there are no such grammar cases in English.
For example:
Это наша машина - This is our car (or) This car is ours
Я вижу нашу машину - I see our car.
You see, In both cases in English you should use "our", but in Russian you must use different forms of it - "Наша" и "Нашу".
Hope it was helpful for you!