A price level or price zone where traders and investors are willing to buy a security, thereby creating demand at that price level, causing the price to stop falling and start rising.
Support is an upward movement in price caused by demand.
Historic price support levels or historic price support/resistance zones are key price levels on price charts that tend to act as a catalyst for the anticipated change in the direction of price.
Price support zones are a naturally occurring part of the price cycle pattern and frequently a self-fulfilling prophecy.