Short-Term Memory? That's ElastiCache - great for remembering what products a user just viewed.

Mid-Term Memory is like RDS or DynamoDB - your app's source of truth.

Long-Term Memory? Think Redshift or AWS Glue/Athena - for when you need to know every item ever added to a user's cart.

Each has its place, and its price tag!

Question for you:

How do you balance cost and performance in your data storage strategy?