A promise is an object that may produce a single value some time in the future: either a resolved value, or a reason that it’s not resolved (e.g., a network error occurred). A pro…
…re stored on your phone — then ultimately on the servers where you back up your phone. For example, if you use an iPhone, all your WhatsApp messages are stored in iCloud.
The concept is: Do something and don’t stop until it’s complete, no matter how long it takes.