Remember that storing information in variables is like putting data into labeled boxes?

For example: let score = 100;

Engagement Message

Can you tell me what value is stored in score?

Now, let's talk about the names we give our variables. Just like you can't label a real box with anything (maybe not symbols or blank spaces), there are rules for naming variables in Rust.

Variable names can contain letters (a-z, A-Z), numbers (0-9), and the underscore character (_).

Engagement Message

Make sense so far?

However, there's a catch with numbers: a variable name cannot start with a number.

So, player1 is a valid name, but 1st_player is not.

Engagement Message

Do you think we can make a variable named 0_day?

Another important rule: variable names cannot contain spaces. If you want to represent a multi-word concept, use underscores () instead.