It's common for programs to embed a database engine. Informally, you're doing this every time you write any structured data to a file. Baking a database into y

It's common for programs to embed a database engine. Informally, you're doing this every time you write any structured data to a file. Baking a database into your application drastically simplifies distribution/deployment and avoids network bottlenecks (at the cost of restricting your choice of storage engine, making it harder to hire staff experienced with your tech, etc).