Elixir's alias, import, require, and use: How Each Shapes Module Scope

Elixir provides four keywords — alias, import, require, and use — that allow modules to reference code from other modules more cleanly. The first three (alias, import, require) are directives that are lexically scoped, meaning they only apply within the block where they are written. Alias creates a shorthand for a module name, import brings functions directly into scope, and require enables the use of macros from another module. The use keyword combines require with a callback, injecting code from another module's __using__/1 macro in a single step. Together, these tools reduce verbosity in Elixir code while giving developers fine-grained control over how names are introduced into a namespace.