Azure Event Hubs is a fully managed, real-time data streaming platform as a service that can stream millions of events per second from any source to any destination with low latency.

Use Event Hubs to:

• Ingest and process millions of events per second  with low latency.
• Supports Apache Kafka, AMQP and HTTPs natively.
• Run Apache Kafka workloads with zero code changes.
• Dynamically scalable and cost-efficient.
• Seamlessly connect with Azure Stream Analytics to build streaming pipelines.
• Pluggable adapters for other cloud services.

Available Tiers:

Premium Tier - Event Hubs Premium tier is designed for running  majority of your production workloads that requires, better performance, better isolation with minimal cross tenant interference, and premium features. You can run streaming workloads with the throughput range of 0-120 MB/s with a Premium namespace.

Dedicated Tier - Event Hubs Dedicated tier offers single-tenant deployments of Event Hubs for customers with the most demanding mission critical workloads. Event Hubs dedicated clusters can handle streaming workloads up to GB/s scale and run them with complete workload isolation and consistent low latency.
Note: Use Event Hubs Cluster service if you want to use Dedicated tier

Standard Tier - Event Hubs Standard tier can be used for relatively smaller production workloads that doesn't require high-end performance, isolation and premium features. You can run streaming workloads with the throughput of 0 - 40 MB/s with a standard namespace.