Explain what output() and outputFromObservable() are in modern Angular and how they differ from @Output().

import { Component, output } from '@angular/core';
import { interval } from 'rxjs';
import { outputFromObservable } from '@angular/core/rxjs-interop';

@Component({
  selector: 'app-timer-button',
  standalone: true,
  template: '<button (click)="triggerEvent()">Click Me</button>'
})
export class TimerButtonComponent {
  btnClick = output<string>();
  timerTick = outputFromObservable(interval(1000));

  triggerEvent() {
    this.btnClick.emit('Button clicked!');
  }
}