PhP is an acronym for Hypertext Preprocessor. It is a server side, open source, scripting language that uses a PhP processor model to interpret PhP within HTML documents, making it a great choice for creating dynamic web pages.

It was released in 1995 by Rasmus Lerdorf and is compatible with all major operating systems. Initially, it was written with the bases of the C programming language, and has evolved into the PhP 8.3 that we know today.

With Php being a server-side language, that means that the scripts are executed on the server and then sent to the client as plain HTML. The PhP source code is not seen on the client side, only the output.

Here is an example of PhP syntax:

<?php
// Simple PHP code example
$name = "Josh";
echo "Hello, $name!";
?>

That script will output "Hello, Josh" to the browser.

PhP is a powerful tool for web development. Here are a few features:

1. Easy to use: PhP has a syntax that is easy to learn and understand.
2. Intergration: PhP can be used with various databases to dynamically use the data.
3. Flexiblity: PhP can be used in the development of simple websites or large complex web applications.
4. Support: There is a large list of resources, frameworks, and libraries to help with PhP developement.

You can easily use Php with Javascipt. Here is an example:

<?php
// PHP code to generate JSON response
$data = array("name" => "Jim", "age" => 20);
header('Content-Type: application/json');
echo json_encode($data);
?>

javascript
// JavaScript code to consume API endpoint
fetch("api/data.php")
  .then(response => response.json())
  .then(data => {
    // Work with the retrieved data
    console.log(data.name, data.age);
  });

In web development, PhP is a flexible and very powerful language. It's ease of use, integration, flexibility, and strong support make it a popular choice amongst developers.

References
1) https://www.php.net/manual/en/intro-whatis.php
2) https://wpwebinfotech.com/blog/php-javascript-integration/#:~:text=While%20PHP%2C%20the%20server%2Dside,into%20a%20captivating%20digital%20space.
3) https://www.simplilearn.com/tutorials/php-tutorial/what-is-php