What Does Database Engine Mean?

A database engine is the underlying system that a database uses to function. Many different technologies rely on internal “engines,” which are the fundamental building blocks on which they operate.

Techopedia Explains Database Engine

In general, referring to an “engine” for a technology implies that that specific module contains the core code for that technology’s operations. In database design, a database engine is composed of the component of the system that actually stores and retrieves data.