Command Query Responsibility Segregation (CQRS) is an architectural pattern that separates read and write operations in order to provide better performance and scalability.

It is important to note that CQRS is not a new technology, but rather a design approach that can be implemented using various technologies. The key benefit of CQRS is that it allows developers to optimize read and write operations separately, which can lead to significant performance gains.

One common pitfall when implementing CQRS is that the two separate systems (the read and write sides) can become out of sync, which can cause data inconsistencies. To avoid this, it is important to carefully design the event-sourcing component of the system.

Overall, CQRS can be a powerful tool for increasing performance and scalability in web applications. When used correctly, it can help avoid common pitfalls and ensure data consistency.