What is a rabbi?

A rabbi is a Jewish religious leader and teacher. If a Jewish person has a religious question, they usually go to a rabbi. Rabbis also give spiritual advice. They are not appointed by god.
a rabbi is a spiriual leader. each community has at least one rabbi.
Rabbis ARE Jewish, and they're teachers and clergy people.
A Rabbi is an advanced Torah-scholar, who in some cases also leads a Jewish community, teaches Torah, and/or renders decisions in Jewish law.
Some major Rabbis in the past were Ezra, Hillel, Rabbi Yochanan ben Zakkai, Rabbi Eliezer, Rabbi Yehoshua, Rabbi Akiva, Rabbi Judah ("the prince"), Rabbi Ashi, Rabbi Saadia Gaon, and thousands more.