Hi John,
A Page in Business Central is a user interface for displaying and manipulating data from a table. Pages can be customized by developers to add new fields or modify existing ones, and they are used to modify, create, and delete records, also pages can be filtered, sorted, and searched to display specific records.
Query, on the other hand is a database object used to retrieve data from one or more tables in a specific way. It is like a saved search and can be used to filter records. Queries can be created by developers to extract data for reporting etc. Unlike pages, queries are not user interface components means they are not designed for data entry or modification..
Regards