There are many ways to witness. A young person might simply say to their friends "I do not use drugs or get drunk because of my religion". This is a witness. A person may tell their classmates, workmates and friends about their beliefs. A person might go to other people's houses and talk about their beliefs, or invite the people to join in the rituals of the religion, such as going to church or to a religious festival. A person might have printed material such as books or leaflets that they give to other people to read. A person might travel to a different country to teach, to work in a health service or to help people in some other way. (People who do this are called "missionaries".) These are different ways that people witness to their religion.