Stupid question about bid and ask.

When you see something like this

Bid Size Ask Size
100 1000

Are there more buyers than sellers or vice versa? The reason I ask is because when most people sell a stock, they sell at the bid. But market makers sell at the ask. What are the sizes showing? Is the 1000 shares at the ask market makers trying to sell or a trader buying?

Also is are the sizes shown on level II in the hundreds (200 is really 20000) ?
 
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