From the BBC:
> Think of going online to visit a website like ordering some food.
> When you enter the site, the web server takes your request and runs the PHP code - like a waiter taking your order to the kitchen.
> The PHP code searches the site's database and follows a script to prepare the page - like a chef following a recipe to make a meal.
> When complete, the web server then delivers the page to the browser, and it appears on screen - that’s your waiter bringing you your dish.