What format is the database stored? Can the database be accessed from a website on another server?
Thanks for your help
EE stores its data (by default) in a MySQL database using InnoDB type tables (earlier versions of EE used MyISAM type tables): MySQL or Percona are listed as requirements for the latest versions of EE, but it may work off other similar SQL type databases (e.g. MariaDB).
Accordingly, as remote access operation is supported by MySQL, it is perfectly possible to run EE with data from a different database server (either co-located or remote), and / or to access EE's datatables directly from remote points.