# Glossary This article defines terms specific to the Kendo UI Charts for Angular. For detailed information about chart elements, refer to the [Chart Elements Overview](https://www.telerik.com/kendo-angular-ui-develop/components/charts/elements) article. ## Chart Structure | Term | Definition | | ---------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Axis** (*Plural* **axes**) | A fixed reference line for measuring coordinates. Charts can have category axes, value axes, and specialized axes for specific chart types. | | **Category Axis** | An axis that displays discrete categories or time periods. Used to organize data points along a horizontal or vertical line. | | **Value Axis** | An axis that displays numeric values. Represents the scale for measuring data point values in the chart. | | **Chart Area** | The outermost container for all chart elements. Configure background color, border styling, and dimensions through the chart area properties. | | **Pane** | A separate section within a chart that contains its own set of axes and series. Stock charts commonly use multiple panes to display different data types. | | **Plot Area** | The container for data visualization enclosed between the axes. Does not apply to donut, pie, pyramid, and funnel charts. Refer to [Plot Area](https://www.telerik.com/kendo-angular-ui-develop/components/charts/elements/plot-area) for configuration options. | | **Plot Band** | A colored range that highlights a specific area on an axis. Use plot bands to mark target ranges, thresholds, or zones. | ## Data and Visualization | Term | Definition | | -------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Series** (*Plural* **series**) | A collection of data points with a specific visualization type such as `line`, `column`, `bar`, or `area`. Each series represents a dataset. Data points can be numbers, arrays (tuples), or objects. | | **Category** | A discrete value or label used to group data points on the category axis. Categories can be text labels, dates, or other identifiers. | | **Data Point** | A single value or set of values in a series that represents one measurement or observation. | | **Tuple** | A data structure with multiple values, represented as an array in JavaScript—for example, `[1, 2]` or `['category', 100, 50]`. Charts use tuples to define multi-dimensional data points. | | **Data Binding** | The process of connecting chart series to data sources. Supports array binding, observable binding, and integration with Angular services. | | **Aggregate** | A calculated summary value such as sum, average, min, or max applied to grouped data points. | | **Trendline** | A line that shows the general direction or pattern of data over time. Helps identify trends in the dataset. | ## Interactive Features | Term | Definition | | ---------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Crosshairs** | Lines perpendicular to the axes that help users identify exact values at the cursor position. Crosshairs appear on hover. | | **Tooltip** | A popup that displays detailed information about data points when users hover over or tap chart elements. | | **Drill-Down** | A navigation pattern that allows users to move from summary data to detailed views by clicking chart elements. Refer to [Drill-Down](https://www.telerik.com/kendo-angular-ui-develop/components/charts/drill-down) for implementation details. | | **Pan and Zoom** | Interactive features that let users navigate large datasets by panning (moving the visible area) and zooming (changing the scale). Refer to [Pan and Zoom](https://www.telerik.com/kendo-angular-ui-develop/components/charts/pan-zoom) for configuration. | ## Visual Elements | Term | Definition | | -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Markers** | Visual symbols that highlight individual data points on line, area, and scatter charts. Can be circles, squares, triangles, or custom shapes. | | **Error Bars** | Visual indicators that show the variability or uncertainty of data points. Display ranges above and below data points to represent statistical confidence or measurement error. | | **Legend** | A guide that identifies series using colors, symbols, and labels. Helps users understand what each series represents. | | **Labels** | Text elements that display values, categories, or information on chart elements such as axes, data points, and series. | | **Notes** | Annotations that highlight specific data points or ranges with text, arrows, or custom icons. | | **Title** | Text that describes the chart or axis. Can be positioned at the top, bottom, left, or right of the chart or axis. | ## Specialized Charts | Term | Definition | | --------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Sparkline** | A small, simple chart that displays trends in a compact space, typically without axes or labels. Refer to [Sparkline](https://www.telerik.com/kendo-angular-ui-develop/components/charts/sparkline) for details. | | **Stock Chart** | A specialized chart for financial data that includes features such as date range selection, multiple panes, and stock-specific indicators. Refer to [Stock Chart](https://www.telerik.com/kendo-angular-ui-develop/components/charts/stock-chart) for configuration. | | **Navigator** | A control in stock charts that allows users to select and navigate date ranges in the dataset. | ## Rendering | Term | Definition | | -------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **SVG Rendering** | The default rendering mode that creates charts using Scalable Vector Graphics. Provides high-quality visuals that scale without quality loss. | | **Canvas Rendering** | An alternative rendering mode that uses HTML5 Canvas for improved performance with large datasets. Refer to [Rendering](https://www.telerik.com/kendo-angular-ui-develop/components/charts/rendering) for mode comparison. | | **Animation** | Visual transitions that occur when the chart loads or updates. Animations make changes more noticeable and engaging. | ## See Also * [Chart Elements Overview](https://www.telerik.com/kendo-angular-ui-develop/components/charts/elements) * [API Reference of the Charts](https://www.telerik.com/kendo-angular-ui-develop/components/charts/api) * [Angular Charts Homepage](https://www.telerik.com/kendo-angular-ui/charts)