Programming languages are the languages used to write software programs. There are many programming languages with different syntax, paradigms, and purposes.
CSS (Cascading Style Sheets) is a style sheet language used to describe the visual presentation of a document written in HTML or XML. It is used to define the layout, fonts, colors, and other visual aspects of a web page.
HTML stands for HyperText Markup Language. It is a markup language used to create web pages and other online content that can be displayed in a web browser.
PHP (Hypertext Preprocessor) is a server-side scripting language used primarily for web development. It is used to create dynamic web pages by generating HTML, manipulating databases, and processing user input.