Companies need stock market for gathering investment that cannot be offered by private players. IPO is the first time they allow the public to invest provided they follow the regulations of SEBI. BSE and NSE are the 2 exchanges in India. The face value of a company does not determine how well it’s performing. SEBI make sures there is no malpractices in the exchange. For long term profits, one can be an investor and a trader in the other case.