Materialized views are schema objects that can be used to summarize, precompute, replicate, and distribute data. E.g. to construct a data warehouse.

A materialized view provides indirect access to table data by storing the results of a query in a separate schema object. Unlike an ordinary view, which does not take up any storage space or contain any data

view is a tailriad representaion of data,its access data from existing table,it have logical structure,cant space occupation.

but meterailzedview stores precaluculated data, its have physical structure, space occupation

Diffence between View Materialized view

If you (Change) update or insert in view the corresponding table will affect. but changes will not affect materialized view.

materialized views to store copies of data or aggregations.Materialized views can be used to replicate all or part of a single table,
or part of single table, or to replicate the result of a query against multiple tables.refreshes of the replicated daa can be done automatically by the database at time intervals.

A view do no derive the change made to it master table after the view is created.

A materialized view immediately carries the change done to its mater table  even after the materialized view is created.

view- the select query is stored in the db. whenever u use select from view, the stored query is executed. Effectively u r calling the stored query. In case u want use the query repetadly or complex queries, we store the queries in Db using View.

where as materialized view stores the data as well. like table. here storage parameters are required.