Liquidity refers to the amount of buy and sell orders in the market and is necessary for prices to move up or down. Retail traders generate liquidity at certain technical analysis patterns like trendlines, support and resistance levels, double tops and double bottoms by placing orders to buy or sell at these levels based on rules they have been taught. Market movers are aware of these areas of liquidity and sometimes manipulate prices to grab the orders before making a larger move, as liquidity allows for prices to move more easily in that direction once consumed.