Antisemitism is hostility toward or discrimination against Jews as a religious or racial group.
Zionism, Jewish nationalist movement with the goal of the creation and support of a Jewish national state in Palestine, the ancient homeland of the Jews (Hebrew: Eretz Yisraʾel, “the Land of Israel”)., where antizionism is the opposition to Israeli nationalism.
Everyone keeps conflating these two, and it's quite annoying. And I'll say it louder for the people in the back: OPPOSING ISRAEL'S INDISCRIMINATE GENOCIDE IS NOT ANTISEMITISM. It is in no reference to Jews, either as a religion or a race, it is towards the Israeli government and their nationalistic followers that allow for the slaughter of men, women, and children.