What does #id in input tag mean?

Question

From this Angular.io tutorial, I show:

where I do not unde

Answer 1

It is used as an element selector within a component...

component.html

component.ts

@ViewChild('searchBox') input; 

ngAfterViewInit() {
  console.log(input.nativeElement); // logs the javascript object for the element.
  console.log(this.input.nativeElement.value); // logs 4
}