CSS is called "Cascading Stylesheet",which is used for look and feel of a website.

There are following three types of CSS:

1. Inline
2. Internal
3. External

Example of Inline Css:
<p style="color:colorname;"></p >
Example of Internal Css:
<style> p{ //properties } </style > Example of External Css:
it is writeen in seperate file having extension .css and our properties are expalin in this file

In CSS classes are defined by . and id is defined by #
<style> .classname{ //properties } #idname{ //properties } </style>

There are Following types of Selectors in CSS:

1. Class Selector
2. Id Selector
3. Element Selector
4. Universal Selectors
5. Group Selectors