ZRdb is a database that serves to describe both KZFPs and Repeats (including LTR,SINE,LINE, and SVAs). The database contains information on the sequences, domains and DNA binding specificities of various KZFPs, while also providing information such as the classification and consensus sequences of different Repeats. By utilizing the existing ChIP-seq data of KZFPs, ZRdb also describes the binding repression and co-evolution relationship between KZFPs and different Repeats, ranking these relationships according to reliability.