A database is essentially a stored collection of information. This information, or data, is constantly being changed or updated by users, and is, in a sense, a big virtual file cabinet where all of your records or files exist.
PHP, or Hypertext Preprocessor, is a server-side scripting language used in web development and helps to create dynamic web pages. PHP is embedded into HTML and is commonly used in conjunction with MySQL. PHP is used to create web pages written in HTML
Hypertext Markup Language, or HTML is a standard markup language used for web development, to create web pages or applications. HTML can be used to produce writing, links, pictures, and more on these web pages.