Gmail has played a vital role in online selling. Before selling any commodity seller needs to brand or promote their product using digital tools like Gmail, Facebook, Twitter, etc. Amongst all these Gmail is the cheapest. If a product is going to trade between two business enterprise then Gmail is the best option. If you are thinking to implement your idea through your phone then also Gmail is better than any other apps, like Gmail holds only one error that is Gmail temporary error which is caused by downloading from unknown sources which have malicious/virus files.