This graph describes the spread of COVID19 in US. The vertical bars represents the numbers and the horizontal lines counts the days from 29.03.2020. The y axis numbers are written in scientific format which means that you will have to multiply is by 1e6 (writtern of the top left) to get the actual number. This clearly shows how rapidly the virus spread around the country. It also shows that the health care institutions ware strong strong enough to keep the death rate at such low amount.