Adverbs modify a verb, an adjective, or another adverb.
An adverb tells more about a verb in the sentence.
(He runs fast, It rained hard yesterday)
An adverb describes more about an adjective in the sentence.
(The weather is very cold today, The room is really clean)
Adjectives can be changed to adverbs by adding 'ly'
(loud::loudly, quick::quickly, slow::slowly)
Inorder to change adjectives ending in 'y' into adverbs, change the 'y' to 'i' and add 'ly'
(easy::easily, happy::happily)