doc: improve explanation about built-in modules

PR-URL: #52762
Fixes: #52599
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>

doc/api/esm.md

@@ -293,12 +293,12 @@ mandatory:
 | ---------------- | ---------------- |
 | `'json'`         | [JSON modules][] |
 
-## Builtin modules
+## Built-in modules
 
-[Core modules][] provide named exports of their public API. A
+[Built-in modules][] provide named exports of their public API. A
 default export is also provided which is the value of the CommonJS exports.
 The default export can be used for, among other things, modifying the named
-exports. Named exports of builtin modules are updated only by calling
+exports. Named exports of built-in modules are updated only by calling
 [`module.syncBuiltinESMExports()`][].
 
 ```js
@@ -1145,8 +1145,8 @@ resolution for ESM specifiers is [commonjs-extension-resolution-loader][].
 
 [6.1.7 Array Index]: https://tc39.es/ecma262/#integer-index
 [Addons]: addons.md
+[Built-in modules]: modules.md#built-in-modules
 [CommonJS]: modules.md
-[Core modules]: modules.md#core-modules
 [Determining module system]: packages.md#determining-module-system
 [Dynamic `import()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/import
 [ES Module Integration Proposal for WebAssembly]: https://github.com/webassembly/esm-integration

doc/api/modules.md

@@ -380,7 +380,7 @@ them as different modules and will reload the file multiple times. For example,
 `require('./foo')` and `require('./FOO')` return two different objects,
 irrespective of whether or not `./foo` and `./FOO` are the same file.
 
-## Core modules
+## Built-in modules
 
 <!--type=misc-->
 
@@ -396,20 +396,31 @@ changes:
 Node.js has several modules compiled into the binary. These modules are
 described in greater detail elsewhere in this documentation.
 
-The core modules are defined within the Node.js source and are located in the
+The built-in modules are defined within the Node.js source and are located in the
 `lib/` folder.
 
-Core modules can be identified using the `node:` prefix, in which case
+built-in modules can be identified using the `node:` prefix, in which case
 it bypasses the `require` cache. For instance, `require('node:http')` will
 always return the built in HTTP module, even if there is `require.cache` entry
 by that name.
 
-Some core modules are always preferentially loaded if their identifier is
+Some built-in modules are always preferentially loaded if their identifier is
 passed to `require()`. For instance, `require('http')` will always
 return the built-in HTTP module, even if there is a file by that name. The list
-of core modules that can be loaded without using the `node:` prefix is exposed
+of built-in modules that can be loaded without using the `node:` prefix is exposed
 as [`module.builtinModules`][].
 
+### Built-in modules with mandatory `node:` prefix
+
+When being loaded by `require()`, some built-in modules must be requested with the
+`node:` prefix. This requirement exists to prevent newly introduced built-in
+modules from having a conflict with user land packages that already have
+taken the name. Currently the built-in modules that requires the `node:` prefix are:
+
+* [`node:sea`][]
+* [`node:test`][]
+* [`node:test/reporters`][]
+
 ## Cycles
 
 <!--type=misc-->
@@ -552,7 +563,7 @@ folders as modules, and work for both `require` and `import`.
 <!--type=misc-->
 
 If the module identifier passed to `require()` is not a
-[core](#core-modules) module, and does not begin with `'/'`, `'../'`, or
+[built-in](#built-in-modules) module, and does not begin with `'/'`, `'../'`, or
 `'./'`, then Node.js starts at the directory of the current module, and
 adds `/node_modules`, and attempts to load the module from that location.
 Node.js will not append `node_modules` to a path already ending in
@@ -1166,6 +1177,9 @@ This section was moved to
 [`module.id`]: #moduleid
 [`module` core module]: module.md
 [`module` object]: #the-module-object
+[`node:sea`]: single-executable-applications.md#single-executable-application-api
+[`node:test/reporters`]: test.md#test-reporters
+[`node:test`]: test.md
 [`package.json`]: packages.md#nodejs-packagejson-field-definitions
 [`path.dirname()`]: path.md#pathdirnamepath
 [`require.main`]: #requiremain