SoftwareEngines
SoftwareEngines, often simply called engines, are software subsystems that provide core, reusable functionality intended to be used by multiple applications. An engine encapsulates a well-defined domain capability—such as data processing, rendering, search, or business workflow—and offers a stable interface that host applications can interact with.
Common engine categories include game engines, rendering engines, database engines, search engines, workflow or rules engines,
Architecturally, engines are often decoupled from host applications and communicate through clear interfaces or message passing.
Historically, the engine concept emerged with specialized subsystems in software such as rendering and database processing