What is From ?
From is (prep) 1. showing the place where something starts or started He comes from Germany. The bees went from flower to flower. We’ve had a letter from the bank. He read the book from beginning to end or from cover to cover. Take three from four and you get one. I took a book from the pile on his desk. 2. showing the time when something starts or started I’ll be at home from 8 o’clock onwards. The hours of work are 9.30 to 5.30, from Monday to Friday. From now on I’m going to get up early. 3. showing distance It is more than 3 km from here to the railway station. 4. showing difference Can you tell butter from margarine? His job is totally different from mine. 5. showing a cause He died from the injuries he received in the accident. He suffers from angina. She suffers from coughs every winter. 6. showing material items made from aluminium
source: Easier English, Student Dictionary Upper Intermediate Level