An adjective is a word or phrase that describes a noun. for example “Kate’s shirt is red”. red is describing the shirt.
An adverb is a word or an expression that modifies a verb, adjective, another adverb, determiner, clause, preposition, or sentence. Adverbs typically express manner, place, time, frequency, degree, or level of certainty. it also answers questions like “why” “how” “where” or “when”