Charts are basic tools used by technical analysts to determine and predict stock market price fluctuations. A chart is used to display the price of each security (x-axis = time and y-axis = price). Charts can show the evolution of a sector, an index, or an entire market. They also provide an overview of the evolution of prices or a volume of securities. The temporal scope (x-axis) can also be changed to display trading in a single day, specific time ranges, months, or years.