Visualforce - Beyond Basics Series 47 - Extend standard sObject

What is the purpose of extending the sObject ?

There's no inheritance to standard sObject. So, if one wants to extend the record, one need to create a wrapper to store the record inside it.

How to do that ?

The wrapper is a Apex Class which will have the record and other extended fields. So, in visualforce page, both standard and extended fields can be used seamlessly.

Where is the Code ?

Any Screenshots ?

Walk through in a video ?