what is difference between a Model and an Entity

Question

I am confused to understand what is the meaning of this words:

Entity, Model, DataModel, ViewModel

Can an

Answer 1

Entity:

An entity is the representation of a real-world element within Object Relational Mapping (ORM) as the Entity Framework. This representation will be mapped to a table in a database and its attributes will be transformed into columns. An entity is written using a POCO class that is a simple class, as you can see in the following example in C#:

using System;
using System.Collections.Generic;
using System.Text;

namespace MyAplication.Entity
{
    public class Person
    {
        public long PersonId { get; set; }
        public string Name { get; set; }
        public short Age { get; set; }
    }
}

Working with UI creation is a complex task. To keep things organized, programmers separate their applications into layers.

Each layer is responsible for a task and this prevents the code from being messed up. It is in this scenario that the architectural patterns like the MVC and the MVVM appear.

Model:

Within the MVC we have a layer responsible for representing the data previously stored, a given could be an instance of a person modeled in the previous example. This layer is the Model. This template will be used to construct the view.

ViewModel:

A ViewModel in the MVVM architecture is much like a Model in the MVC architecture. However a ViewModel is a simplified representation of the data with only the information that is required for the construction of a view.

using System;
using System.Collections.Generic;
using System.Text;
using MyAplication.Web.ViewModel.BaseViewModel;

namespace MyAplication.Web.ViewModel.Person
{
    public class PersonNameViewModel : BaseViewModel
    {
        //I just neet the name
        public string Name { get; set; }
    }
}

DataModel:

It is simply an abstract model (this model is different from the MVC layer model) which establishes the relationships that exist between the elements that represent real-world entities. It is a very comprehensive subject.