How do Angular's computed() signals work? [closed]

I don't understand how computed() works. How does Angular knows when to update it ? I don't see anything that can trigger its update in the following code, but it actually gets updated each time a new value is sent in chartData.

import { Component, computed, input } from '@angular/core';
import { ComponentChartData } from '../../../../models/component';

@Component({
selector: 'app-chart',
standalone: true,
templateUrl: './chart.component.html',
styleUrl: './chart.component.scss',
})
export class ChartComponent {
chartData = input.required<ComponentChartData>();
datasets = computed(() => this.chartData().datasets);
}

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