what is dynamic page? what is the difference between a HTML page and php page

Answer 1

Dynamic page basically refers to an interactive page. HTML pages are mostly static, they are made and edited later, you can't interact much except for a few links. But with php you can create forms, input data and get prompts based on your data. So it provides an interactive web environment.

Answer 2

it's isn't really dynamic page , it's more dynamic variable which can change content.
in a html (.html) page you can't use some php code but in a php (.php) page you can obviously run php code and write some html content like echo ("<h1> Hello world </h1>");

Answer 3

HTML is client side, php is server side.