Simple Definition:

A messiah is a person who is believed to be chosen by a higher power (God) to lead and save a group of people (such as a religious community). This person is often considered to have special abilities or qualities and is expected to bring positive changes and fulfill certain prophecies.

For example, in Christianity, Jesus is considered the messiah who came to save humanity and bring them closer to God. In Judaism, the messiah is an awaited figure who will restore peace and unite the Jewish people.

Very Simple Definition:

A messiah is a special person chosen by God to save and help a specific group of people.

For example, Jesus is a messiah because he is believed to have been sent by God to help people and bring them closer to God.