How are modules found?

[Tamas_Papp]

I asked something similar here:

Packages, modules, and files

The exact connection between packages, modules, and source files is unclear to me, even after reading the Pkg3 Julep and the relevant chapters of the documentation. Please note that this is not a criticism of either the current state or what will replace it with Pkg3, I am just trying to understand how things work. My understanding of the status quo is the following: A package is a collection of files and metadata. The have names like Foo.jl. A module is a piece of source code, eg module …

but did not get an answer.

My understanding is that things change with Pkg3 anyway.