AWSグラビトン(AWS Graviton)とは？英語で回答してください。
AWS Graviton(Alpine AL73400)is a 16-core ARMv8 SoC designed by Amazon(Annapurna Labs)for Amazon's own infrastructure. The chip was first unveiled by Peter DeSantis during Amazon's AWS re:Invent 2018 and has been in deployment for user access since early 2019. These processors are offered as part of Amazon's EC2 A1 instances. The Graviton features 16 Cortex-A72 cores organized as four quad-core clusters, all operating at 2.3 GHz.