This means Mr. Reyes is doing buy-and-sell or retail. He buys products from online platforms (like Shópee or Lazada) at lower prices and sells them for profit. This kind of business is popular because it requires small capital and can be done from home. Depending on where or how he sells it, it can either be at a brick-and-mortar store where customers go him. Or he could be doing house-to-house sales by knocking on people’s doors to sell the items. He might have an online store or uses a platform to sell his inventory, this is called e-commerce or online selling.