Divya,
When someone adds a URL (link) to a signature line, it will appear at the bottom of every post that he or she makes. This is basically considered using the Coffee Forum to get free Internet advertisement for the person's website or product.
If that person constantly mentions a product or adds the same links to their posts, it becomes obvious that he or she is Spamming the Coffee Forum. Spamming is done in a variety of ways, and here on the Coffee Forum, we try to avoid allowing any type of spamming whenever we can.
If a business or website owner wants to advertise here on the Coffee Forum website, he or she is welcome to contact the Forum Administrators and pay a monthly fee to be a Supporting Vendor (Forum Sponsor). There are a variety of priviledges that accompany being a Supporting Vendor, and for some people it's worth it.
But for most people, they're happy with trying to use the Coffee Forum to get free advertisements wherever they can. We try to avoid that. When they overdo it, they're considered Spamming the Forum, and then one of the Moderators has to deal with it. (such as banning the person forever!)
I hope this helps to answer your questions.
Rose