Messianic Judaism is the spiritual movement made up of Jews who are people of Jewish heritage who maintain their Jewish identity and acknowledge Yeshua as the Messiah. However, a great number of non-Jews have become part of messianic congregations in a departure from traditional Christianity and a pursuit of understanding the Bible in a way that gives traditional Jewish interpretation a great deal of influence.
The following article gives more detail about what sets apart Messianic Judaism from the traditional Christian expressions of faith: https://www.jewishvoice.org/read/blog/difference-between-messianic-judaism-and-christianity