As tablet technology becomes more widely available for preschoolers at home and at school, it is necessary to examine the effects of these tools in early childhood education classrooms. This chapter focuses on the use of iPad electronic books (e-books) and their effects on preschoolers' understanding of vocabulary and story comprehension as well as engagement during reading activities in an urban New Jersey school. The results of this study highlight the positive ways in which iPad e-books can be used to support literacy in preschool classrooms. This chapter also includes recommendations for preschool teachers who may be considering using e-books in their classrooms. (author abstract)