PNG to EPS converter

I got a request from a client to send them an image on their website ,but they want it converted from the .PNG format it is currently in to a .EPS format.
can someone give me a little assistance with this.
I'm not familiar with a .EPS format.
(I know it's used in printing but that's all I know about it)

Thanks in advance for any help.
Take care

what graphics software do you use? Corel can do it, I'm sure many others can as well.

the gimp will be able to convert the file format http://www.gimp.org :)

http://www.vectormagic.com/
Although EPS is not always used for vector, it's the only reason this would be needed.