What Does $ Represent in Jquery

Dollar Sign is nothing but it’s an alias for JQuery, You can either write JQuery or $

What is JQuery UI

JQuery UI is another javascript library build on top of jQuery JavaScript Library, It provides different rich UI compnents like datepicker,tabs,accordion,button etc.

What Are the Advantages of JQuery

1. As JQuery is a light weight library it does not take much time to load
2. All the jQuery fucntions are compatible with all the browsers
3. Using JQuery, accessing DOM elements become easy as Jquery provides lot of selectors

What is the Difference Between Jquery.min.js and Jquery.js

Both JS provides same set of function but in jquery.min.js all variables names have been reduced to short names and that most whitespace & comments have been taken out making it light weight

Is There Any Differnce Between $(document).ready(function() and $(function()

Both represent the same.
$(function() is shorthand representation of $(document).ready(function()