# Mapping

## Introduction

Mapping is a specialized component used to match expected [Data Entity](/akb-wiki/astrakode-wiki/smart-contract-ide/technologies/ethereum/components/data-entities.md) types with any currently available data entity in a Function's flow. 

A mapping works in the following way: 

* on the right-hand side, one is able to see the data entity type that the mapping expects. 
* On the left-hand side, the user is able to select or define a data entity to match (type-wise) to the one on the right-hand side.

<figure><img src="/files/cdUQwlWoY1kidLZVnwcZ" alt=""><figcaption></figcaption></figure>

## Configuration

The Map ***From*** Data Entity is the data entity that must be selected or defined in order to match the expected data entity type.

The Map ***To*** Data Entity is the data entity (type) that the Mapping expects the Map From data entity to be matched to.


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