How models and schema works?

[Smaily]

Tell us what’s happening:
Hi there , I’m trying to pass this test lately but I couldn’t understand the concept of models and schemas I visited the hint link and I have few question about the solution

const mongoose = require('mongoose');
mongoose.connect(process.env.MONGO_URI);

/** 2) Create a 'Person' Model */
var personSchema = new mongoose.Schema({
  name: String,
  age: Number,
  favoriteFoods: [String]
});

/** 3) Create and Save a Person */
var Person = mongoose.model('Person', personSchema);

var createAndSavePerson = function(done) {
  var janeFonda = new Person({name: "Jane Fonda", age: 84, favoriteFoods: ["eggs", "fish", "fresh fruit"]});

  janeFonda.save(function(err, data) {
    if (err) return console.error(err);
    done(null, data)
  });
};

1. What does this line do exactly
   var Person = mongoose.model('Person', personSchema);
2. Whats the diffrence beween Schema and Model ?
3. Why we wrote the word Person in capital letter ?
4. What the word “done” in function(done) do ?
5. what’s the exact job of the last line done(null, data) ?
6. Finely Im getting this message in the consol after trying to run my code :

Your App Link

boilerplate-mongomongoose-1

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36

Challenge: Create and Save a Record of a Model

Link to the challenge:

freeCodeCamp.org

[colinthornton]

First off I’d suggest checking out the documentation which explains about both Schemas and Models.

• Getting Started
• Schemas
• Models

[Smaily]

THANKS but still don’t have answers for my question
why there is a model and schema if they are just a duplication of each other thats drives me to the second question which is the job of this line
var Person = mongoose.model('Person', personSchema);
and ofcourse the rest

1. What the word “done” in function(done) do ?
2. what’s the exact job of the last line done(null, data) ?
3. Finely Im getting this message in the consol after trying to run my code