In this study, children's literature was defined according to a review of the related literature. The value and positive effects of children's literature on children were discussed and opinions of 2nd grade elementary school students' regarding their most and least favourite books were investigated. Participants consisted of 15 students enrolled in elementary school near the city centre of Ankara, Turkey. The research data were obtained from semi-structured interviews with participating students as well as students' book scoring forms used to rate 25 books provided to them. First, students' scoring forms were reviewed and analysed to determine their choices. Next, interviews were conducted with students regarding the reasons for their book selections. Data obtained from the student interviews were evaluated through content analysis. Finally, according to the students' responses, the characteristics that made up their most and least favourite books were explained for the educators and parents. Students frequently mentioned internal features, especially the characters and plot of the story, as the primary reasons for determining their most and least favourite storybooks. Also, it was shown in the findings that having characters that were animals, good-hearted, and/or funny as well as having action and adventure within the stories made the storybooks the children's most favourite. Whereas not having action, being boring, and/or having unsolved problems within the stories as well as being short or having unknown words and expressions made the storybooks the children's least favourite.