The Structured Package Format provides a way to organize Wolfram Language packages so that they are easier to design, write and maintain.

PackageInitialize — create a package by reading the surrounding Wolfram Language files

PackageExported — make a symbol visible outside a package

PackageScoped — make a symbol visible everywhere within a package, but not outside of it

PackageImport — use symbols from another package

Needs  ▪  BeginPackage  ▪  EndPackage