Simple user interaction on a website can be done
using the alert(), prompt(), and confirm() methods in JavaScript.

Although these methods aren’t used in real-world projects,
it’s still worth learning them as part of the language fundamentals.

All three are somewhat similar to console.log() in how they output info.

Alert()

The syntax is very simple — and so is its behavior.
alert() creates a modal popup with a message you define:

alert('Hello, friends!');

Confirm()

This method is used to ask the user a yes/no question. For example: “Are you over 18?”

let result = confirm('Are you over 18?');
console.log(result);

It also opens a modal dialog, but with two buttons: OK and Cancel. Clicking OK stores true in the result variable Clicking Cancel stores false

Prompt()

Use prompt() to ask the user to input some text. You can also provide a default value, just like a placeholder in HTML.

let answer = prompt('How old are you?', '');
console.log(answer);

Any value returned from a prompt() will be a string, even if the user types a number.

Here’s how to collect multiple answers into an array:

let answers = [];
answers[0] = prompt('What is your first name?', '');
answers[1] = prompt('What is your last name?', '');
answers[2] = prompt('How old are you?', '');
console.log(answers);

These methods — alert, prompt, and confirm — block page rendering until the user interacts with them. That’s why they’re rarely used in modern UIs, but still useful to know for learning and debugging.