PHP
PHP is server side language for dynamic website, It is open source programming language which every one can use PHP,
PHP stand for (Php HyperText Preprocessor ) and many people says that PHP stand for (Personal Home Page).
PHP can update the all contents of website by connecting to database like mySql and more...
JavaScript
Javascript is scripting language and it is not server side language, It always uses for interactive webpages like validating email, user input, Displaying Date and more ...
jQuery
jQuery is javascript library which all the things are ready like function for doing some action just we should call function in our webpage, for example we can show images as Slide Show in the webpage and more interactive action we can do with jQuery.