True or False: A global secondary index can be organized by a primary key that is different from the original table's key.

A global secondary index (GSI) in Amazon DynamoDB allows for a different partition key and an optional sort key than the original table's primary key. This flexibility means that you can query the data using alternate key values, which can help optimize access patterns that are not feasible with the table's primary key alone.

For example, if you have a table with a primary key of "UserId", you could create a global secondary index that uses "Email" as the partition key. This allows for efficient querying based on email addresses, rather than having to rely solely on the user IDs.

The key aspect of GSIs is that they provide this independence from the primary key designated in the main table, enabling more versatile data retrieval options depending on the application's needs.