Idioms & SlangBeginner
Under the hood
PronunciationUN-der thuh HOOD
Definition
Refers to the internal, hidden implementation details of a library, framework, or system that developers usually do not need to see or modify.
Where you hear it
In documentation, architecture discussions, and code reviews when explaining how a feature works beyond its public API.
Examples
The framework handles routing automatically under the hood.
Let's look under the hood to see how the query builder parses SQL.
Common mistake
Thinking you must understand everything under the hood before you can use a tool effectively.