What is the difference between the formula for variance and sample variance?

Degrees of freedom of variance is ##n## but degrees of freedom of sample variance is ##n-1##

Note that

## "Variance" = 1/n sum_(i=1)^n (x_i - bar x)^2##

Also note that

## "Sample Variance" = 1/(n-1) sum_(i=1)^n (x_i - bar x)^2##