Differences between Sidecar and Ambassador and Adapter pattern

I confused between Multi-Container Pod Design patterns.
(sidecar, adapter, ambassador)

What I understand is :
Sidecar : container + container(share same resource and do other functions)
Adapter : container + adapter(for checking other container's status. e.g. monitoring)
Ambassador : container + proxy(to networking outside)

But, According to Istio -Installing the Sidecar, They introduce proxy as a sidecar pattern.

Adapter is container, and Proxy is container too.

So, My question is What is differences between Sidecar pattern and Adapter&Ambassador pattern?

Is the Sidecar pattern concept contain Adapter&Ambassador pattern?