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12 cards from this deck
Validating that user input matches expected format/rules
Prevents errors & ensures data integrity in programs
Returns number of characters in a string
Checks if character is a letter (A-Z or a-z)
Checks if character is a number (0-9)
First character is at position [0], not [1]
Check overall length to prevent index errors
Organize logic; each check only runs if previous passed
Building up strings by adding characters one at a time
Tell user exactly what went wrong, easier to fix input
Empty input, too short/long, unexpected characters
Makes code easier to understand than generic names
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