Database catalog in LSDB is one of the services provided by the Database Center for Life Science (DBCLS). It is a database of databases.There are so many databases in the world, while there are so many users who complain about “databases”. They say “I cannot find appropriate databases for my project!”, “ I cannot really see what kinds of databases are available!” and so on. It is not too much to say that how to make use of databases is a key issue for your research projects. Database catalog organizes the database records by database type, data type, subjects of the study and database provider. And users can post comments on any database.