Question

What is absolute maximum and absolute minimum

Answer 1

Absolute maximum - the largest that a function will ever be.
Absolute minimum - the smallest that a function will ever be.

Answer 2

The absolute Maximum is the highest point on your line (this is different from the retaliative maximum where it is the second highest point on your line).

The absolute Minimum is the lowest point on your line (again different from you r retaliative minimum where it is the second lowest point on your line).