what is marketing and what is the strategy of marketing?

Marketing is a backbone of any business without marketing you can't build a business and marketing is divided by 2 parts first traditional marketing & 2nd Digital marketing but now days  people following only one method  it's Digital Marketing because its so cheap and target only potential customer and its not a limited you will reach millions of people in few seconds marketing is two type basically 1st make a brand and second conversion all business is converted in India so marketing make a brand identify product and sale process so now days most of marketing by digital technology