The chart shows roughly 30 minutes of data, and the black horizontal line represents the current price.
The tick chart is also a line chart, except that the tick chart shows you all the price movements since it only shows a short of amount of time. Typically you will see this type of chart when you click on an asset and choose an expiry time or date that is further out, like several hours or the end of the week. This chart looks very similar to figure 1 (the tick chart), but the x-axis has changed so that you can how the price has moved over a longer period.
Figure 3 shows a different style of chart, which shows more data, called a Candlestick chart. Before starting there a few points about charts which are universal to all forms of charts discussed below. Typically these charts only show a few minutes of data since the price is constantly moving. Being able to see more data allows you to see if there is a trend (a sustained price move in an overall up or down direction), or any chart patterns developing. The line chart only reflects the closing price for each interval the chart uses (unknown in this case since the brokers typically do not allow you to configure your own charts). After the price surged near the middle of the chart, a decline followed it (sizable red bar), which was then followed by another green bar.
For example, you see that the trend over the last several days is up, and the price is also moving up on your tick chart.
For every 15 minutes (or other internal) only the close is recorded on the chart, and then each close is linked to each other creating a continuous line.
The line chart makes everything look clean, while in reality this chart shows that the market is typically more jerky. Sometimes simple is best, but if you want to get more advanced with your analysis you may want to check out candlestick charts.
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