Explain pipes in Angular.

Angular pipes is a way to write display-value transformations that you can declare in your HTML.

A pipe takes in data as input and transforms it into the desired output. In the below example, pipe transforms a component's birthday property into a human-friendly date.

import { Component } from '@angular/core';

@Component({
  selector: 'app-birthday',
  template: `<p>The User's birthday is {{ birthday | date }}</p>`
})
export class UserBirthdayComponent {
  birthday = new Date(1981, 3, 15); 
}

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