AWS Kinesis
AWS family for stream data: Data Streams (Kafka competitor), Data Firehose (managed delivery to S3/Redshift/OpenSearch), Data Analytics (managed Flink).
Data Streams: shards as hardcap (1 MB/s write, 2 MB/s read per shard), data retained 24h–365 d. Billed per shard-hour. Behind Kinesis shards is an implicit ordering — the partition key determines the shard, so the same key always lands on the same place.
Competitor: MSK (AWS Managed Kafka, more flexible), Confluent Cloud, GCP Pub/Sub. Kinesis is the "AWS-native" choice — Lambda, IAM and KMS integrate directly.