Is guild war free?

I've been hearing a lot about the excitement surrounding guild wars in the online gaming community, but I'm curious about the financial aspect. As a gamer on a budget, I'm wondering - is guild war free? Or does it come with a cost? I understand that some games offer free-to-play options but then charge for certain features or activities. I'm hoping to get a clear understanding of whether or not I'll need to shell out additional funds to participate in guild wars. If there are any associated fees, I'd like to know what they are and if there are any workarounds or strategies to minimize the cost. Can you provide me with a detailed breakdown of the financial implications of engaging in guild wars?