What does this code do? // setup var express=require("express"); var http=require("http"); var app=express(); // run the server http.createServer(app).listen(55555); console.log('Express server listening on port 55555'); // <<< here is the Model, the data storage var products = [ { id: 0, name: 'watch', description: 'Tell time with this amazing watch', price: 30.00 }, { id: 1, name: 'sandals', description: 'Walk in comfort with these sandals', price: 10.00 }, { id: 2, name: 'sunglasses', description: 'Protect your eyes in style', price: 25.00 }