Circular RNA (or circRNA) is a type of single-stranded covalently closed 
circular RNA molecule and play important roles in diverse biological pathways. A 
comprehensive functionally annotated circRNA database will help to understand 
the circRNAs and their functions. CircFunBase is such a web-accessible database 
that aims to provide a high-quality functional circRNA resource including 
experimentally validated and computationally predicted functions. CircFunBase 
provides visualized circRNA-miRNA interaction networks. In addition, a genome 
browser is provided to visualize the genome context of circRNA. In this chapter, 
we illustrate examples of searching for circRNA and getting detailed information 
of circRNA. Moreover, other circRNA related databases are outlined.