The key principles of Angular help you build applications with less effort and more organized code. They make developers' work easier by allowing them to focus on tasks instead of getting caught up in the details. Angular, as a set of tools, helps bring all the parts together and makes the application user-friendly.

Components

Imagine you're building a house. Every element in the house, whether it's a room, window, or door, serves a specific purpose. In Angular, these elements are components. Components are responsible for individual parts of the application, such as a form, button, or product list. Each component manages its part of the interface and interacts with other components.

Directives

Directives can be thought of as small "instructions" for the browser. For example, when you want an element to appear only under certain conditions, Angular uses a directive to control that behavior. It's like adding new functionality to existing elements, such as a button or form.

Services and Dependency Injection

Services can be compared to shared "resources" used across various parts of the application. For instance, if you have a service that provides weather information, any component can use that service to display the current weather. Dependency Injection is like not having to search for the resource every time. Angular automatically provides the necessary tools when needed.

Routing

Imagine your application is a store with several departments. Each department is a separate page, and routing helps you "navigate" between these departments without reloading the entire store. This allows users to move through the site like flipping through pages of a book, without unnecessary time delays.

Two-way Data Binding

It's like having a map that shows all the changes happening in your application. When you modify something in one place, it automatically updates elsewhere. For example, if a user changes their address in a form, that information is immediately updated everywhere it's used.

Summary

These principles of Angular—components, directives, services, routing, and two-way data binding—work together to simplify application development, improve code organization, and enhance user experience by making the app more dynamic and easier to maintain.