How many databases does a sybase instance have?

I'm a newbie to sybase and could not find the clear answers on Sybase tutorials/docs - How many databases can one Sybase instance have? Oracle has one instance which corresponds to only one database, is it the same with Sybase ? - What is a master database, is it a db that holds metadata? Does each instance have one master database ? - What is a user database ? Is it similar to a tenant db in sap hana ?