Description : Examples of built-in functions in SASS.
Answer :
SASS provides a range of built-in functions for manipulating values and colors. Some examples include `lighten($color, $amount)` which lightens a color by a specified amount, and `darken($color, $amount)` which darkens it. Functions like `rgba($color, $alpha)` are used to set color opacity, and `percentage($value)` converts a number to a percentage.