Allows to add functionality to a container without modifying the

container itself.

▪ Useful if you want to add logging or monitoring functionality to an

existing container image that you do not control.

▪ Allows you to decouple the main container from the sidecar

functionality, easier to update or replace the sidecar without affecting

the main container.

▪ Allows to run multiple containers in a pod that share the same network

namespace, making it easier to communicate between them.

▪ Allows to add common functionality to multiple microservices without

having to modify the microservices themselves. 

https://learn.microsoft.com/en-us/azure/architecture/patterns/sidecar