While our Hello World application doesn't have any data store such as a database, it is very likely that it won't be the case for most applications. There are many types of databases available on the market, but more often than not, the right thing to do will be to start with a traditional relational database such as MySQL or PostgreSQL. We will talk about NoSQL databases toward the end of this chapter, which at scale are a good supplement to relational databases, but in most cases starting with a different data store will be considered by most as a premature optimization.
In terms of architecture, it is best to break out our stack such that the databases are on their own layer. This is called building ...
