From the Wikipedia:

A web widget is a portable chunk of code that can be installed and executed within any separate HTML-based web page by an end user without requiring additional compilation. They are derived from the idea of code reuse. Other terms used to describe web widgets include: gadget, badge, module, capsule, snippet, mini and flake.

In plain English - it's a way of grabbing a little part of PokerDIY and embedding it on your own website or profile without actually having to go to PokerDIY!

Yes. Putting untrusted web widgets on a web page can be risky but we have partnered with Widgetbox to make the experience smoother and easier.
 
Widgetbox provides an IFrame-based security layer around widgets that prevents XSS attacks, so your website data is completely secure so even if wanted to do anything bad we would not be able to!

You may need to enter your PokerDIY UserID into the widget at some point. If you need to do this, the easiest way is to log in to PokerDIY and go to your profile page (on the homepage, click on "View my Profile as others see it". This will take you to a page similar to this profile. If you look at your browser (Internet Explorer, Firefox etc) address box you will see the URL of your profile which will look something like this:

http://www.pokerdiy.com/Home/PokerPlayerProfile/ID/1/Default.aspx

The number after the "ID" variable is your unique PokerDIY UserID. So in this example the UserID is "1". You can enter a "1" into the WidgetBox settings as required.

These are taken from your active poker league games that you have participated in. The average winnings is your total winnings divided by the number of games you have played. If you have not played in any poker games yet then your scores will be zero.