"Level 2" is where we can see who is looking to bu
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It is also where we can see who is willing to sell (the ask), and how many shares they are offering for what price.
Finally, Level 2 also gives you an idea of what just changed hands......how many shares were just sold/bought and at what pps they were sold at.
Now.....it has a lot more uses, but those are the very simple ones in a nutshell.
It is a good thing to keep an eye on for anyone who is doing some serious buying or selling.