In 2011, a group of people in China were unhappy because they didn't have much say in how their government worked. They wanted to have more of a democracy, which means that the people get to vote and make decisions instead of only a small group of leaders. Some of these people went out into the streets to protest and show their unhappiness.
The government of China did not like this and didn't want people to speak out against them, so they tried to stop the protests. They put some of the protesters in jail and made it very difficult for others to talk about their ideas.
The protesters and the government disagreed about what should be done, and their disagreements continued for some time. Eventually, the protests quieted down and the government's tight control continued. But the ideas of democracy and freedom of speech are still important to many people in China, and they continue to hope that one day they will be able to have more of a say in how their country is run.