An adverb is a word that modifies or describes a verb, adjective, or another adverb.
It provides more information about how, when, where, or to what extent an action is being performed.

1. How:

• She speaks softly.
• He drives recklessly.
• They ran quickly.

In each of these examples, the adverb tells us how the action is being performed: softly, recklessly, and quickly describe the manner in which the speaker speaks, the driver drives, and the runners run.

2. When:

• They arrived late.
• She wakes up early.
• We will meet again soon.

These adverbs tell us when the action is being performed: late, early, and soon describe the timing of the arrival, the waking up, and the next meeting.

3. Where:

• He searched high and low.
• She went upstairs.
• They travelled abroad.

These adverbs tell us where the action is being performed: high and low, upstairs, and abroad describe the location of the search, the movement, and the travel.

4. To what extent:

• He was extremely happy.
• She is slightly annoyed.
• They are very busy.

These adverbs tell us to what extent the action is being performed: extremely, slightly, and very describe the degree of happiness, annoyance, and busyness.