freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-javascript/understanding-case-sensitivity-in-variables/index.md

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title: Understanding Case Sensitivity in Variables
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# Understanding Case Sensitivity in Variables

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## Problem Explanation

A popular programming norm is to use <strong>Camel case</strong> when creating variable names. Notice the first word is lowercase and every following word is uppercase. Here are some examples:

```javascript
var camelCase;
var someNumber;
var theBestVariableEver;
var weWillStoreNumbersInThisVariable;
```