What does it mean to attach a tty/std-in-out to dockers or lxc?

Question

I read some docker docs and I do not understand what it might mean to

• attach a tty
• attach std-in and std-out

for these purposes, I see

Answer 1

Simply put it allows us to attach and detach from the containers terminal. To attach we use the docker attach command and to detach we use the CTRL+P & CTRL+Q command.