node.js - Where is the 'path' module required by app.js of an express application? -

var express = require('express'); var path = require('path'); var favicon = require('serve-favicon'); var logger = require('morgan'); var cookieparser = require('cookie-parser'); var bodyparser = require('body-parser'); 

i'm trying understand express more thoroughly. can find of other modules, except 'path'

path built-in node.js module. can find in documentation.