Support or support level refers to the price level below which, historically, an underlying instrument has had difficulty falling. It is the level at which buyers tend to enter a Buy position and therefore stop the downward trend.
If the price of a stock or other financial asset falls toward the support level, it is a test for the stock; the support is either confirmed or eradicated. Confirmation occurs as buyers move into the stock, causing it to rise. If the price moves past the support level, it means the support level failed, and the market is looking for a new level.