Do I have to pay for my domain every year?

Hello, I've been considering purchasing a domain name for my personal website. However, I'm a bit uncertain about the costs involved. Could you please clarify for me if I need to pay for my domain every year? I've heard some conflicting information and would like to get a clear answer. Is it a one-time fee, or do I have to renew the domain annually? Also, if it's an annual fee, are there any additional costs that I should be aware of? I appreciate your help in clarifying this matter for me.