Newbie question: Types of Brokers

I'm just getting back into active trading.

I'm used to dealing with firms such as e-trade, td waterhouse, etc. What is the difference of these and 'direct retail' & 'prop firms'.

The speed and accuracy of information is, for now, somewhat important, but low costs (commissions, etc) for an someone who trades a lot intermittently is a greater concern.

Just a brief overview is fine for now.

Thanks
 
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