A verb is a part of speech that expresses an action, a state of being, or an occurrence.
Yo hablo - I speak.
(Spanish verb hablar in the present tense)
Tú estabas triste - You were sad.
(Spanish verb estar in the imperfect)
Él se caerá - He will fall down.
(Spanish verb caerse in the future)
Spanish verbs are typically classified by their conjugations - they are divided into verb conjugation groups.