What's An Adverb?

An adverb is a part of speech that modifies other parts of speech like verbs, other adverbs and adjectives. Usually adverbs end in '-ly' as in entirely, extremely, naturally and so on.
They usually answer questions like  where? When? How? Why?
Let's look at some sentences that use adverbs. I am putting the adverbs in bold for your convenience:
The child quickly snatched the lollipop.
The car was running amazingly smooth after we took it to the mechanic.
The lawyer defended her client vehemently.
The girl spoke about her future plans passionately.

Sometimes, adverbs may not end in '-ly' and still serve the modifying function, as in:
The car crashed there.
We often drive to the country on Sundays.

In all of the above cases, ask yourself a how, when, where or why question and you will find out how to identify adverbs. For example, How did the lawyer defend her client? -vehemently-
Where did the car crash? -there-

I hope you understand adverbs better now. Good luck!

An adverb is a part of speech that qualifies another part (except a noun). Usually it describes the way in which an action ( a verb) is being done, eg    The boy ran QUICKLY to the shops.    The man apologised PROFUSELY for being late.    The bus driver braked FIERCELY when the car pulled out in front of him.    As in these examples, adverbs often (but not always) end in -LY.