Propaganda through media is when people try to make you think something by spreading information through things like TV, social media, or newspapers. For example, let's say that someone wants everyone to think that cats are the best pets. They might create a TV commercial that shows happy families playing with their cats, or write articles in newspapers about how cats are better than dogs. They might even use social media to share cute pictures of cats to get people to think about them more.
Sometimes, people might use propaganda to try and control what you think about different groups of people. For example, they might show news stories about how people from a certain country are always doing bad things or make fun of a certain race or religion in TV shows or movies. This is really bad because it makes people think that those groups of people are bad, even though they might not be.
It's important to always think for yourself and not just believe everything you see or hear through the media. It's also important to make sure you are getting information from different sources to see different views and opinions.