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Annotations are customisable labels that can be placed above or behind the chart's data. There are two predefined annotations:
Label annotations: These are labels that can be customised but by default hold the data values you provide. An example of what Label annotations look like can be found HERE. That image is taken from our ShinobiPlay app available from the AppStore.
Band Annotations: These are horizontal or vertical bands that stretch across the entire chart between the two data values you provide. An example of what band annotations look like can be found HERE.
Apart from annotations you also get access to a number of Financial and advanced chart types (e.g. Candlestick, OHLC, Band) along with multiple X & Y axes, Logarithmic and Discontinuous axes.
Let me know if you have any other queries.