Okay kiddo, you know how sometimes grown-ups use bad words when they're very angry or upset? Well, in Italy there are some words that are considered very bad to say. They are called "profanity".
Some of these words are related to religion or God, which is considered very disrespectful. Other words are just really rude and insult people's mother or family. You know how important family is in Italy, right? So, saying bad words about someone's family is a big no-no.
Now, even though these words are not nice, sometimes people still say them when they're upset or trying to be funny. However, it's not a good idea to use these words in front of your parents, grandparents, or teachers. They might not be very happy with you using bad language.
So, it's always better to use polite and respectful words as much as possible, especially when talking to people older than you. Remember, using profanity is not a cool thing to do, and it can hurt people's feelings.