Description
Levene's test is used to assess Variance homogeneity, which is a precondition for parametric tests such as the t-test and ANOVA.
The test can be used with two or more samples. With two samples, it provides the test of variance homogeneity for the t-test. With more samples, it provides the test for ANOVA.
If the significance from this test is less than 0.05, then variances are significantly different and parametric tests cannot be used (and a non-parametric test will probably have to be used).
Discussion