A backend is a set of server-side technologies that enable the development of web applications. It is responsible for the storing, processing, and delivery of data, and also provides an interface for the frontend (client-side) to interact with the backend. By using a backend with Vue, there are numerous benefits available, such as access to data and services not available on the client-side, user authentication and authorization, and scalability for a Vue application to handle more requests and users.
In conclusion, the best backend for Vue depends on the requirements of the application. However, Node.js, Express, and Flask are three of the most popular backends for Vue, as they provide a range of features and tools to make it easier to develop applications.