Both put component data into the template, but interpolation always converts the value to a string, while property binding passes the value with its type.
Interpolation uses double curly braces, {{ }}.
<h1>Welcome {{userName}}</h1>
<img src="{{imageUrl}}">
Property binding puts the element property in square brackets, such as [src].
<h1 [textContent]="userName"></h1>
<img [src]="imageUrl">
Inside an attribute, Angular treats interpolation as a property binding, so both img lines do the same thing. Use property binding for non-string properties, such as a boolean, a number or an object.
Neither syntax is more secure. Angular treats every bound value as untrusted, and it sanitizes and escapes values from template bindings and interpolation alike.
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