The transaction log records all changes made to the data, and cloud object storage ensures that the data is stored redundantly across multiple locations, but does not guarantee durability in case of a regional outage.

The transaction log is used to track changes made to the data for auditing purposes, while cloud object storage is used to store the data in a distributed manner without ensuring atomicity or durability.

Delta Lake uses the transaction log to record changes made to the data, ensuring atomicity by allowing transactions to be rolled back if necessary, and cloud object storage to ensure that the data is stored in a highly available and durable manner, even in the event of a failure.

The transaction log is used to record changes made to the data, and cloud object storage is used to store the data in a highly available manner, but the system does not ensure durability or atomicity of transactions.