Difference between Data Model and Database Schema in DBMS?

Question

I know the Data Model is basically two types ER-Model and Relational Model & Database schema is also two type Physical and logical.

But I can not understand what

Answer 1

A schema can have multiple models related with it and each model can have multiple instances related with it.

for eg.

animalSchema{name:String, type:String}

mongoose.model('carnivores', animalSchema)

It simply means that carnivores is a model that is based on animalSchema.

mongoose.model('herbivores', animalSchema).

It simple means that herbivores is a model that is also based on animalSchema.

const lion = new carnivores();

const tiger = new carnivores();

These both are the instances of the carnivores model of the schema animalSchema

const deer = new herbivores();

const cow = new herbivores();

These both are the instances of the herbivores model of the schema animalSchema