Why should I use this program?
You should use the program to run some things like Avast antivirus statistics, some items on Yahoo! Messenger etc.
Adobe Flash Player is a plugin for web browsers (Internet Explorer in this case) that will allow you to run flash content (flash videos, SWF animations, games) within websites. It is free of charge, and you can download and install it from the official web page. For further information, I suggest you check the review page of the product.