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What does `morgan` module have to do with express apps?

In an express tutorial, the author was using the npm module morgan. What can morgan do for an express app? Could anyone help me understand this?

Got this by googling, but I do not understand anything here:

var express = require('express')
var morgan  = require('morgan')

var app = express()
app.use(morgan('combined'))
morgan('combined')

morgan(':remote-addr :method :url')

morgan(function (tokens, req, res) {
  return req.method + ' ' + req.url
})

thanks in advance!

Morgan is used for logging request details. However, the snippet in your question doesn't make sense because it's not actually a single coherent snippet top to bottom. It is a series of examples of the various types of options you can pass to morgan. In a real program, you would only need one of them. For example:

var express = require('express')
var morgan  = require('morgan')

var app = express()
//This tells express to log via morgan
//and morgan to log in the "combined" pre-defined format
app.use(morgan('combined'))
//That's it. Everything in your snippet after this are just
//other variations your might want to use
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