Taste-test your ingredients! Make sure everything is fresh and ready.
Like a chef checking if vegetables are fresh, we inspect data quality before using it!
All columns have correct data types
Age values between 0-120
3 email addresses have invalid format
2 duplicate records found
Is age a number? Is email text? Like checking if you grabbed salt, not sugar!
Age can't be 200! Salary can't be negative! Like checking ingredient amounts make sense.
Email must have @. Phone must be 10 digits. Like checking recipe format is correct!
Same person twice? Like accidentally adding salt twice to your recipe!