Why The Value Of Correlation Coefficient Is Always Between -1 And 1.?

Why the value of correlation coefficient is always between -1 and 1?"

Something can be anywhere from 100% correlated with another variable, to completely opposite at -100% correlated.  1 to -1 is a method to express coefficients in that range.

Indeed it is Elementary.  But the sub-zero varient of zero is not always greater than the elevation.

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Actually it just represent relationship which is direct or positive, indirect or negative & No relation. If it is towards positive not perfect it is less than +1. If it is towards negative not perfect it is greater than -1. Hope that answers the question

It indicates the level of correlation between groups of data. If the number is positive, there is positive correlation; conversely, a negative value indicates a negative correlation. Positive values closer to 1 show strong positive correlation whereas positive values closer to 0 show weak positive correlation. This is the same with negative values closer to -1 and 0, they have stronger and weaker negative correlation respectively.