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Are BID and ASK the minimum and maximum?
So in your screenshot, someone or some group of someones is willing to buy 3,000 shares at $3.45, and someone or some group of someones is willing to sell 2,000 shares at 3.88. Without getting in to the specific mechanics, you can place a market buy order for 10 (or whatever number) shares and it will probably transact at $3.88 per share because that's the lowest price for which someone will currently sell their shares. As a small fish, you can generally ignore the volume notations in the bid/ask quotes.