Someone - I forget who, sorry! - mentioned earlier...
# getting-started
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Someone - I forget who, sorry! - mentioned earlier that a module is all of the files compiled in a single execution of kotlinc. Maven, gradle, ant and idea all build the classes for one project (Jar) in one execution. Technically you could do it manually and build several modules into one Jar though, or even across multiple jars... No idea why you'd do that though...