What Is the Sup Metric in C[0,1]?

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What does this mean ! ?
 
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C[0,1] means continuous functions defined for the closed interval 0 to 1. Sup metric means the distance between two functions f and g is defined as the sup |f(x)-g(x)| over that interval.
 
it means the distance between two functions is the furthest apart their graphs ever get, over any point of the domain.
 

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