It stores data in a single Availability Zone.
It is less expensive than the S3 Standard and S3 Standard-IA classes.
S3 Intelligent-Tiering requires automation and monitoring.
It is ideal for data with unpredictable or frequently changing access patterns.
If an object is not accessed for 30 days, it is moved to the S3 Standard-IA class.
Objects accessed while in the S3 Standard-IA or S3 One Zone-IA classes are moved back to S3 Standard.