What is the difference between a schema and a user?

• A schema is collection of database objects, including logical structures such as tables, views, sequences, stored procedures, synonyms, indexes, clusters, and database links.
• A user owns a schema.
• A user and a schema have the same name.
• The CREATE USER command creates a user. It also automatically creates a schema for that user.
• The CREATE SCHEMA command does not create a "schema" as it implies, it just allows you to create multiple tables and views and perform multiple grants in your own schema in a single transaction.
• For all intents and purposes you can consider a user to be a schema and a schema to be a user.