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What is means of correlation coefficient for two variables

What does this mean while we say that the correlation coefficient for two variables is -1? What does it mean if this value were zero? What does it mean if it were +1?
Correlation is calculated by the correlation coefficient, represented through the letter r. The correlation coefficient can take on values among +1.0 (perfect positive correlation) to -1.0 (perfect negative correlation).  The closer r is to +1.0, the more the two variables will tend to move along with each other at the similar time.  The closer r is to -1.0, the more the two variables will tend to move opposite each other at the similar time.  An r value of zero denotes that the variables’ values aren't associated at all.  It is known as statistical independence.

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