The XMLHttpRequest open() Method

The open() method prepares the request for submission. Within it, we define three key parameters:

1. Method: The type of HTTP request (most commonly "GET" for reading or "POST" for submitting data).
2. URL: The path to the file on the server (e.g., ".txt", ".json", ".php").
3. Async: A boolean value (true/false) that determines whether the request should execute asynchronously.