Publicity is when you tell a lot of people about something so they know about it too. Just like when you tell your friends about your favorite toy or cartoon, companies and famous people also want to tell a lot of people about their new product or thing they are doing. Publicity can help them get more friends or make more money.
To get publicity, companies and famous people use things like TV commercials, newspaper articles, and social media posts. They want to make sure everyone knows about their new thing so they can buy it or talk about it with their own friends. Sometimes they do special events, like concerts or product launches, to get even more publicity.
But just like when you talk to your friends and they might not all like your favorite toy or cartoon, not everyone will like the thing a company or famous person tells everyone about. So sometimes people might say bad things about it too. That's why it's important for companies and famous people to try and make sure they have good things to say about their new thing and to answer any questions people might have.