Campaigning is all about trying to change things by telling other people what you think about something.
If something is important to you then you might want to tell other people about it so that they can help you change it.
This could mean contacting politicians to tell them about things that are important to you.
It is not just politicians you can contact. You can also contact businesses, charities, celebrities, or anyone you think could help you with the things that are important to you.
You could contact local or national newspapers, as well as local or national radio and television stations.
You could set up a page on a social networking website like Facebook or Twitter.
Or you could set up your own website to tell people about the things that are important to you.