What would flash player be used for in a phone?

I am debating between the Samsung Infuse and Samsung Captivate. Flash player is one of the differences between them that I do not understand. What is it used for and is it very important for the use of the internet.

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).