How to talk to independent docker container by name? [duplicate]

Question

I have two distinct docker containers, independent from each other.

Now I want to talk from one to the other. Is that only possible by IP:PORT? Or even by application name?

This is the container I want to talk to:

docker-compose.yml:

services:
  my-container:
    ...
    ports:
      - "8090:8080"
    extra_hosts:
        - "host.docker.internal:host-gateway"

Is there a way that another container could simply connect to http://my-container? Or would I always have to go the way injecting the host network ip with extra_hosts to both containers, and then connect with http://host.docker.internal?

Sidenote: all my containers are on the same default docker bridge network.