Research suggests that bullying does occur in kindergarten. The extent of bullying in Norway and other Scandinavian countries is estimated to be about 12%. The purpose of this study is to investigate children's understanding and experiences of bullying. We use a qualitative approach and have conducted individual interviews and focus group interviews with a total of 31 children, 5 year-olds, in 4 different kindergartens. Additionally, observations were made of 4-5 year-olds in the same kindergartens, 142 children in total. The results show that the children describe bullying as doing or saying "something mean". Exclusion from play is what all the children fear the most. This study shows that 1-2 children in each kindergarten are systematically excluded from play, and these children are overlooked by both other children and the adults in kindergarten.