What Is Automation?
Automation is when robots comment and/or like Instagram posts from other people automatically for you. These don't just exist on Instagram, but on all platforms. Instagram and Twitter are most often automated though.
There are plenty of services online that anyone can sign up to. They can do lots of things, automatically follow/unfollow other users, automatically like photos on a specific hashtag, or even comment on photos.
And We Get It
There's a lot of pressure to be online. Once online, the pressure is on growth. More followers, more engagement – more is always better.