DataStax Astra DB provides the ability to develop and deploy data-driven applications with a cloud-native service, without the hassles of database and infrastructure administration. Astra DB allows you to create databases in minutes, with reduced complexity, fewer operational concerns, and an approachable entry point for developing your applications. By automating tuning and configuration, Astra DB radically simplifies database and streaming operations. Astra DB is a true database-as-a-service (DBaaS) offering that provides simplified cluster management with flexible pricing.
For more Astra DB documentation, see What is Astra DB?
Astra Streaming, powered by the open source project Apache Pulsar, is a hosted pay-as-you-go cloud-native, distributed messaging and streaming platform. Pulsar has a concept of Tenants which is the top level administrative unit. A tenant has multiple namespaces for logical grouping of different applications. In each namespace you can create multiple topics to send and receive data. Your Astra Streaming account allows you to create multiple Pulsar tenants, namespaces and topics.
For more Astra Streaming documentation, see What is DataStax Astra Streaming?