They are basically miniature Walmarts, they sell the same crap such as food, snacks, health and beauty aids, cleaning supplies, basic apparel, housewares and seasonal items.

Walmart hates them, they are taking a healthy chunk outta their business.

$25.6 billion in sales in fiscal 2018
15,472 retail locations as of March 1, 2019
Approximately 135,000 employees
Ranked #123 on the Fortune 500 list as of May 2018