Most email, instant message and chat clients are unencrypted.  This means that anyone with some knowledge of networking has the ability to intercept these types of communications and read the data in clear text.  If you are sending credit card numbers, social security numbers or other confidential information this leaves you open to identity theft.  When sending sensitive information, encryption is the only way to ensure only your intended recipient may read your transmission.  With PIE you can be assured any information you request will be sent in a secure manner.

With PIE there is no need to install any add-ons, and the recipient you request or send data  to/from does not need to have an account with PIE.  You may send or request data to anyone whom has email address.