Backend empowers the functionality of an entire application. It pulls together the frontend and the database to portray a presentable application before users. Traditional backend architecture consists of an application server, a web server and a database at its core. If the architecture is growth-oriented, it might include a load balancer, a host of service integrations such as email notifications, push notifications and queuing services. A backend is structured to imbibe the type of functionality that you want from the app and your business niche.
Guide to Backend Development in Applications