meghanjackson

In an order driven market, buy and sell orders come in at various prices. Those buy and sell orders that match in price are executed. There are no specialists/market makers in this market.
A Price Driven market is run by specialists (market makers). Specialist provides a quote to buy and sell a security (bid and ask prices) and market orders are executed at these prices.
Your question is too general. If this does not help, may be you can frame a more specific question.