Results of an aggregation query that is stored in the database
They are similar to views in the sense that they are a logical representation of a table.
Materialized views are saved to the disk so they are similar to querying an table.
Materialized views can be updated periodically as defined during creation
DML operations cannot be performed on materialized view
Difference between View and Materialized View
Materialized Views in Oracle | Database Journal
What is the difference between Views and Materialized Views? - Stack Overflow