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What is a service and why use it?

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01

Understand the problem

Explain services in Angular.

services
02

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03

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A service is a class (usually @Injectable({ providedIn: 'root' })) that holds reusable logic or state — data fetching, business rules, shared state — kept out of components. Components inject it via DI, keeping the UI thin and the logic testable and shareable.

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04

Read the code

A service injected into a component
import { Component, Injectable, inject } from '@angular/core';

@Injectable({ providedIn: 'root' })   // app-wide singleton
export class CounterService {
  private count = 0;
  increment() { return ++this.count; }
}

@Component({
  selector: 'app-root',
  standalone: true,
  template: '<button (click)="onClick()">count: {{ value }}</button>',
})
export class AppComponent {
  private counter = inject(CounterService);  // DI, no 'new'
  value = 0;
  onClick() { this.value = this.counter.increment(); }
}
05

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