The research examines the concepts of 'friendship' and 'best friend' among preschool children (n=52) who live in different countries (Sweden and Turkey), with the aim of presenting their ideas about the concepts of 'friendship' and 'best friend'. For this purpose, 52 children, 4-5 year olds (25 from Turkey and 27 from Sweden) participated in semi-structured interviews, the content of which was later analysed. A content analysis method included the identification of codes that could be used for comparison across the two populations through statistical analysis. The main results of our study show that, despite the fact that preschools are organized differently in Sweden and Turkey, children from both populations used prosocial behaviour and their perceptions about what a best friend is more similar between children in these different cultures than they are different.