Google Firebase offers a number of products that help speed up the development of both mobile and web applications. The cornerstone product is their real-time database which offers a No-SQL style JSON store. It’s pretty magical to work with. Combine it with their free authentication service, and you can build entire applications with just front-end code (HTML, CSS, JS).
Transactional email is a type of automated email between a sender and a recipient. It differs from promotional email in that transactional email is triggered by events, interactions, or preferences within a service or application rather than by a company’s marketing campaign. While transactional emails can help fulfill marketing needs by recovering abandoned carts or re-activating inactive users, these emails are primarily functional and provide an anticipated response to an (in)action or a request made by the recipient. Unlike promotional emails which are bulk distributions of the same marketing message to many recipients simultaneously, transactional emails are personalized and typically sent to individuals one at a time.