In Lightning Web Components, the @track decorator was initially used to mark private reactive properties, ensuring the component re-renders when the property’s value changes. However, with recent updates to LWC, the @track decorator is no longer needed for most use cases. All objects and arrays are now reactive by default. @track is only necessary if you want to track changes to the properties of an object or to the elements of an array, not just to the object or array itself. It provides fine-grained control over reactivity for complex data structures.
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