Angular Combination Charts are made by combining multiple chart types that supports axis like line, column, area, etc. They are also referred as Combo Charts or Mixed Charts.
Combination of Range & Line Charts are generally used to show the range (high & low values) along with it's average values. For example high & low temperature can be shown using Range Area Chart & it's average using Line Chart. Similarly, Line Charts are also used to show technical indicators when they are combined with Candlestick / OHLC Charts.
Combination Charts (Combo / Mixed Charts) are formed by combining multiple chart types in one chart.
Most commonly used features in Angular combination charts include color, showing series name in legend, hiding / unhiding dataseries on clicking legend, etc.