# What is the purpose of Istio's EnvoyFilter resource?

Istio, Medium (Advanced), Advanced Configuration. https://k8wiz.com/uquiz/what-is-the-purpose-of-istios-envoyfilter-resource

- A. To filter environment variables
- B. To customize the Envoy proxy configuration
- C. To filter traffic based on environment
- D. To create new Envoy proxies

**Answer:** To customize the Envoy proxy configuration

**Explanation:** EnvoyFilter in Istio is used to customize the Envoy proxy configuration. It allows you to modify the generated Envoy configuration to add, modify, or remove filters, listeners, routes, etc.