Here's why:
* It modifies verbs, adjectives, or other adverbs: It tells us *how* something is done, *to what degree* something is true, or *how much* something is happening.
* "I absolutely love pizza." (modifies the verb "love")
* "This is absolutely delicious." (modifies the adjective "delicious")
* "You are absolutely right." (modifies the adverb "right")
Let me know if you'd like more examples!