Die casting is used in automobile company. There are number of casting process. How to identify die casting differ from other casting production methods?
You're beginning to sound like a broken record.
Do some independent research on the subject of die casting.
We cannot give you a formal die casting education here. You need to get the basics down first.
Learn how to use a search engine. Go to the library and read a book on die casting.
"He who overcomes others has force; he who overcomes himself is strong." -- Lao-tzu, Chinese philosopher