This is a level on the chart which is the price at which traders monitor buyers ("bulls" - see), and do not allow the price to fall below this line, constantly making deals to buy. A support line can be set up through your terminal. Select the top menu bar, above the graph, click on the oblique line - trend. And set it so that it runs along the lower border of several recent well-marked fluctuations on the price chart. Here you will see a support line. The price should reach the support line at the upper boundary - line resistance (see) and come back. If the price suddenly goes below this line, there will be a "breakdown" (see). This means that more people want to sell currency on the market than buy it.