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### Which data type represents a special value that means 'no value'?

### Which data type represents a variable that has been declared but not yet assigned any value?

### What data type is used to list multiple items of the same type in a specific order?

### Which keyword is used to declare a variable that cannot be reassigned a new value?

### What is the scope of a variable declared with 'var'?

### What keyword is used in JavaScript to declare a variable with block-level scope that can be reassigned?

### What keyword is used in JavaScript to declare a variable whose assigned value cannot be changed?

### What is the original meaning of `const`?