In the context of MySQL, certain system databases are excluded from dumps by default when using the mysqlpump utility. Specifically, the 'information_schema' and 'sys' databases are not included in such dumps. The 'information_schema' contains metadata about the database objects and is not typically included in backups. Similarly, the 'sys' database is a system database providing various system views and functions primarily for performance and monitoring purposes, which is also excluded by default. Therefore, the two databases that will be excluded from this dump are 'information_schema' and 'sys'.