Investing in companies listed on the National Stock Exchange of India (NSE) requires opening a Demat and Trading account through a SEBI-registered stock broker. Investors can choose between discount brokers (such as Zerodha, Groww, Upstox, or Angel One) or full-service traditional brokers (such as ICICI Direct or Kotak Securities). Once your account is verified, KYC-compliant, and linked to your bank account, you can transfer funds and purchase shares of listed equities, exchange-traded funds (ETFs), or government securities directly through their digital trading platforms or mobile applications during normal market hours.