The following is the main difference: An adjective (or a noun used as an adjective) is a qualification for a noun, meaning that it better specifies the noun. An adverb is a qualification (changes the meaning of, specifies) for a verb, or for another adjective; you can think as the name 'adverb' as meaning 'adjacent to a verb'

Adjective: 1. English is AN IMPORTANT language. ("Important" modifies -- describes -- "language." Older grammar books also label "an" an adjective. Newer books call it a "determiner.") 2. English is IMPORTANT. (refers to "English." Completes the sentence "English is ____.") Adverb: 3. He speaks English CORRECTLY. (modifies "speaks." How does he speak?) 4. She is EXTREMELY nice. (modifies the adjective "nice." Tells HOW nice she is.) 5. I speak VERY slowly. (modifies the adverb "slowly." Tells you the EXTENT of my slowness in speech) 6. HOPEFULLY, you will soon speak English very well. (Modifies -- refers to -- the WHOLE sentence. A shorter way to say: IT IS TO BE HOPED that you will soon speak English very well.) ***** English, THE INTERNATIONAL language, is EXTREMELY POPULAR. It is studied by MANY people throughout THE world. the = adjective ("determiner" in newer grammar books). international = adjective. extremely = adverb. popular = adjective. many = adjective.

adverbio=describe al verbo, nos dice mas de él. adjetivo= Nos dice como es el sustantivo(la persona, la cosa, etc) Camilo es alto (alto:adjetivo) La casa es azul (Azul:Adjetivo) ¿Como es camilo? ¿De que color es la casa? No recuerdo ejemplos de adverbios.