The chart shows the Bitcoin exchange rate against the dollar in real online time. The red candles indicate a fall in the rate, green - growth. The BTC exchange rate at this second is on the right edge of the chart and is highlighted in green. In the top menu you can toggle the period of the rate display: 1 minute, 30 minutes, 1 hour and other intervals. Right now you are looking at the online Bitcoin exchange rate in one day intervals.