Ariel David explains them:

There is no civil marriage. Jews can only be married in a religious ceremony, by an Orthodox rabbi under the authority of the Chief Rabbinate, the top religious authority for Jews in Israel. This means there is also no interfaith marriage between Jews and non-Jews, since Orthodox Judaism does not allow mixed unions.

Israelis who belong to other streams of Judaism, such as Reform or Conservative, must still tie the knot in front of an Orthodox rabbi in a traditional ceremony if they want their marriage to be recognized by the state.

Other religious authorities recognized by Israel, including those of Muslims and of Christian denominations, also do not perform interfaith marriages, so a Jew cannot marry a Muslim or a Christian unless one member of the couple converts to the faith of his or her partner. (Islamic law technically allows for a Muslim man to marry a Christian or a Jewish woman, as long as their children are raised Muslim, but Muslim clerics and scholars frown on the practice.)