In English, "come back" and "go back" both mean "to return". However, they are used differently, at least to the British.
"Come back" indicates that someone would return HERE, a place that the person currently presents.
Example: I'm leaving for home now. I'll come back again tomorrow at 8.00.
Meanwhile, "Go back" expresses someone to return THERE, a place that the person is heading to.
Example: I have finished my work. I'm going back home now.
In short, "come back" HERE and "go back" THERE.
Photo from the internet.
Credit goes to BBC Learning English here.
Lam Nguyen.