Using data from other database to populate a new database
This should do it.

update DB2.[dbo].[Categories]
set
    DB2.[dbo].[Categories].Name = DB1.[dbo].[category].catDescription,
    DB2.[dbo].[Categories].URL = DB1.[dbo].[category].catLink
from
    DB2.[dbo].[Categories] inner join
    DB1.[dbo].[category] on DB2.[dbo].[Categories].ID = DB1.[dbo].[category].catParent