Used to express 'both A and B'; 'whether it's A or B'; 'not to mention A and also B'.
Long explanation:
This grammar structure is used to provide two examples or two situations to demonstrate a certain characteristic or situation. It's a way of mentioning two items of the same theme to generalize or emphasize something applicable to them both. In English, it can be understood as 'both A and B', 'whether it's A or B', or 'not to mention A and also B'.