Some of its important features are as follows:

• Lightweight messaging system
• Capable of high throughput with low latency operation
• Capable of handling many messaging scenarios by bringing in various components within ZeroMQ
• Capable of asynchronous programming
• Not very good support for transaction based messaging systems
• Licensed under GPL
• Supports variety/multiple language bindings

Use/choose ZeroMQ if:

• You are looking for the simplest messaging system in regards to implementation
• You are looking for fast message transmission of transient messages
• You need to connect multiple applications using messaging architecture and should have a very low footprint on the nodes
• You need an asynchronous messaging model