Is it necessary that an S3 bucket be in the same availability zone where an EC2 want to access it?
S3 buckets are replicated across availability zones within the same region by default, except the One Zone class. However, S3 supports cross-region replication (CRR), wherein S3 buckets are asynchronously copied to different regions.
S3 buckets are region specific.
An Amazon S3 bucket is owned by the AWS account that created it. Bucket ownership is not transferable to another account. When you create a bucket, you choose its name and the AWS Region to create it in. After you create a bucket, you can't change its name or Region.
S3 doesn't have availability zones, but it does have regions. And yes, having your bucket in the same region will make communication faster.
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