Data binding is a core concept in Angular which allows communication between a component and the DOM, making it very easy to create interactive applications without worrying about pushing and pulling data. One-way data binding in Angular can be done by using either interpolation or property binding.

With Interpolation you can invoke a method in the component, concatenate strings, perform mathematical operations, or change the properties of DOM elements. The Template Expression is represented by the “{{…}}” double curly braces. Angular evaluates the expression and replaces it with the result of the expression.


1. Interpolation is one way from component to View
2. Binding source is a Template expression “{{ … }}”
3. The Template Expression must result in a string.

Property binding allows us to bind a property of a DOM element to the value of template expression. The Property Binding uses the “[..]” brackets. The binding target (DOM property) is placed inside the square brackets. The binding source is enclosed in quotes.

<h2 [innerHtml]=”title”></h2>

1. Property Binding is one way from component to View
2. Binding source is a Template expression in quotes “…”
3. Non-string return values are allowed

Both interpolation and property binding provide a one-way data binding. The main difference is that interpolation returns a string, and property binding can return other data types.

If you want to set an element property to a non-string data value, you must use property binding.

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