Here's what it says at the paypal Site:
Send money online – it's easier than running to the ATM or writing a check, and perfect for just about any reason.
•Settle up for a lunch bill
•Pay friends back for concert or sports tickets
•Chip in for a group gift

Plus, it's free for the sender and recipient in the US when you send using your bank account balance or PayPal balance.

SEND MONEY NOW