Lobbying in the United States is when someone tries to talk to government leaders and politicians to get them to do something they want. For example, a group of people might try to convince their government to make a law that helps protect the environment. They might hire a person called a lobbyist to help them do that.
Lobbyists are like messengers. They speak to politicians and government leaders on behalf of a group or company. They try to persuade these people to make rules or laws that will benefit the group or company they represent. Sometimes they will give these important people money or gifts to try and convince them to make the changes they want.
Lobbyists have to register with the government to let them know who they work for and what they're trying to do. Otherwise, they could get in trouble for not following the rules. However, not all lobbyists are honest or ethical. Some of them will use shady tactics to try and trick politicians into doing what they want.
Overall, lobbying can be an important way for people to bring about change and make their voices heard. But it's important to make sure that lobbyists are transparent about who they represent and that they follow the rules.