Can you explain what is meant by Persistence Context in ORM and why it is needed?

The Persistence Context in ORM is a memory area where objects associated with the current database session are stored. It manages the state of objects: new, modified, deleted, or loaded from the database.

Why is the persistence context needed:

• Change tracking: ORM automatically detects changes in objects and synchronizes them with the database.
• Caching: objects loaded from the database are stored in the context to avoid repeated queries.
• Transaction management: changes are applied to the database within a transaction.

Example: when an entity is loaded from the database, ORM places it in the persistence context. If you modify the object's fields, ORM is aware of these changes and will automatically update the record in the database upon saving.