Circular RNAs (cRNAs) are single-stranded circular RNA molecules with no free ends. They are classified into three types; exonic, intronic and intergenic. This book highlights the mechanisms and biogenesis of circRNAs in plants. It also highlights the features of circular RNAs of plants. The functional and regulatory roles of circRNAs in plants are also discussed. This book is of interest to geneticists, researchers, students, and scientists.