# What is a model?

The word “model” came to our language from French (modele), but comes from the Latin modulus, which literally means “sample” or “measure”. A model is a simplified representation of any device, process, or phenomenon. In another interpretation, a model is a specific system that allows one to get an idea of a similar system. And what is a model in modern Russian?

A model is a conditional or real model that is created for the knowledge (study) of objects, phenomena and events. Any model must meet such requirements as universality, accuracy, expediency, adequacy and economy.

## Types of models

Depending on the purpose of the model can be the following types:

- Heuristic is an imaginary image (for example, an information model).
- Full-scale - material model, similar to real systems (layout, business model, social model, etc.).
- Mathematical model is a sample expressed in mathematical and formal-logical forms (analytical model, numerical model).
- Intermediate - a model that combines features of different types (sketches, graphs, drawings, etc.).

## Model levels

The level of the model is determined by the degree of simplification of the process for which the model is created. In total, there are 4 levels of models:

- functional model is created to study the functioning (features of work) of the system;
- the principal model is created to study the phenomena underlying the functioning of the system;
- structural model can look like a simplified graphical representation of the functioning of the system or a topological sample, reflecting the interrelationships of the components of the system;
- The parametric model is created by the method of mathematical modeling to identify the quantitative relationship of the main and auxiliary elements of the system.