When you "forward" someone an e-mail message, it means that you send them a message that someone else sent to you before. Most e-mail software includes a button for this that's marked "Forward" or "Fwd".

Notice that there are two correct ways to use "forward". One is "forward (someone)(a message)":

I forwarded Jane the invitation that you sent me.

The other way is "forward (a message) to (someone)":

I forwarded the invitation you sent me to Jane.

The choice of which one to use depends on what you're talking about. If the topic of the conversation is Jane, I would use the first example. If the topic is the invitation, I'd use the second.