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Noob question.Attaching to docker containers "Docker exec" or "Docker attach"

Hello,
I have a question regarding Docker exec and Docker attach comands.

I have the following containers:

[root@taurus01 ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
6718c09be711 alpine:latest “sleep 1d” 26 minutes ago Up 26 minutes myservice.1.ogjjv697mmxiqlresjsmjvc7t
cd9fc97a74aa busybox “sh” 2 weeks ago Up 4 hours container2
5f0a41b5d329 busybox “sh” 2 weeks ago Up 4 hours container1

For the busybox image I can use the command “docker attach container1” for example. But for the alpine:latest if I use that the comand window will became irresponsive.

I need to use instead docker exec -it 6718c09be711 sh.
Why is that? Are not all of them containers? Thanks.