Notepad is the most basic editor where you can save any kind of text or data at any time. In notepad, you cannot find advanced features like you can find in WordPad. In WordPad, you can edit your text as per your choice.
You can bold, colour or give any size according to your requirement. But this feature you cannot have on your notepad. You can use notepad in your mobile phones also but word pad you cannot. Both are very helpful to you to you.