It can be considered as a network service that lets you dependably process and migrate data between various AWS storage and compute services, also on-premises data source, at certain time instances.
It lets you easily get access to the data where it was originally stored, you can transform it and process it, also, invariably scale and transfer the results to various AWS services including Amazon RDS, Amazon S3 and etc. You can easily create complicated data processing workloads that are highly-available and fault-tolerant.
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Here is a quick video on How to become an AWS Architect in 2020: