A verb is a word which expresses an action, a process or a state of being.
Jane is happy.
A word used to show an action, state, event or process, e.g. I like cheese; He speaks Italian.
Verbs are one of the major sources of inflection in English.
I eat the pizza.
Jane eats the pizza.
Jane is eating the pizza.
Jane ate the pizza.
Jane has eaten the pizza.