Angular is becoming more reactive with signals

Signal is just a special type of variable that holds a value. But unlike other variables, a signal also provides notification when the variable value changes.

1. A signal is a variable + change notification
2. A signal is reactive, and is called a "reactive primitive"
3. A signal always has a value

A signal is synchronous and is not a replacement for #RxJS and Observables for asynchronous operations, such as http.get

Where can we use signals?

• Use them in components to track local component state
• Use them in directives
• Use them in a service to share state across components
• Read them in a template to display signal values

Or use them anywhere else in your code.