Many companies offer matching gift programs to encourage employees to contribute to charitable organizations. Meaning if you work for a company that has one of these programs implemented--they may match you for a certain amount.
In other words, you donate 5 dollars they will match your donation for 5 dollars--so the charity would get 10 dollars for your 5 dollar donation.
If you don't work for a company that has one of these programs implemented--just put no in the form.
I only know because the company I used to work for had implemented one of sorts.