HTML Links

Question

Can someone explain what an unvisited link means. Explain it in detail.
Can someone explain what an visited link means. Explain it in detail
Can someone explain what an active link means. Explain it in detail.

I completed understand the hover property.

• a:link - a normal, unvisited link
• a:visited - a link the user has visited
• a:hover - a link when the user mouses over it
• a:active - a link the moment it is clicked