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A good grasp of past navigation helps you understand
your current location, since it's the culmination of your journey.
Knowing your past and present locations in turn makes it easier
to decide where to go next. Links are a key factor in this navigation
process. Users can exclude links that proved fruitless in their
earlier visits. Conversely, they might revisit links they found
helpful in the past.
Most important, knowing which pages they've already visited frees
users from unintentionally revisiting the same pages over and over
again.
These benefits only accrue under one important assumption: that users can tell the difference between visited and unvisited links because the site shows them in different colors. When visited links don't change color, users exhibit more navigational disorientation in usability testing and unintentionally revisit the same pages repeatedly
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