Verbs and Adverbs have the same relationship as athletes and sports commentators. The adverb is the sports commentator who helps you visualize the action (the verb) by describing how it occurred and how the athlete acted. The commentator sticks with describing action; adverbs describe action verbs only.
Most--but not all--adverbs agree with their verbs by ending in -ly.
The pass was thrown briskly
They are fumbling excessively today
He frantically maneuvered around the end tackle
The referee aggressively called a foul
