Glossary term
What is scope chain? Meaning for developers
The path the engine walks to find a variable: this context's memory, then its parent's, then the parent's parent, until it hits the global one and then null.
Learn it properly · JavaScript CoreLesson 7: Scope Chain and Lexical EnvironmentLesson 4 showed one function looking outward to Global. This lesson extends that into a full chain — as many levels deep as your code is nested — and gives it a proper name: lexical scope, decided entirely by where you physically wrote your code, never by which function called which.