The Simple Answer When analyzing site stats and traffic the one question that comes over and over is "What is the difference between a new or unique visitor? We'll keep it simple.
If I discover your site today and only visit once in the morning and once in the afternoon (from the same computer and same browser) I am one unique visitor. But I had two visits. The first time that I visited, I had a New Visit, because I had never visited before. The second time that I visited (that afternoon), I had a repeat visit (because I *had* visited before.) So in this example, we have two visits. We also had only one Absolute Unique Visitor and one New visit.
When analyzing site stats and traffic the one question that comes over and over is "What is the difference between a new or unique visitor? We'll keep it simple.