An antisemitic canard is a false and hateful story about Jewish people that is circulated to spread racism and mistrust of Jewish communities. It's called a canard because it's a lie, and it's called antisemitic because it is usually about how Jewish people are bad or harmful. Usually, antisemitic canards involve trying to make people think that Jewish people are controlling the government or media, have too much power, or are responsible for bad things that have happened. It's important to remember that even though these stories may seem convincing, they are rarely true and they are only meant to upset people and hurt the reputation of Jewish people.