As with all programming languages, we need a way to store information within our application. This information can be anything and, as with every other language, it's stored in a variable. However, unlike every other language, Rust does not store data in the same way as (say) C does.

To that end, in this chapter we will do the following:

• Understand variable mutability
• See how Rust stores information in a variable, and the types of variable available
• See how Rust deals with vector variable types
• Understand how Rust can and cannot manipulate variables
• See how Rust can pass variables
• Take a look at how Rust stores a variable internally