A unique view represents the total number of subscribers that have viewed your message, a view is the total number of times your message has been viewed.
For example, if you had 2 unique views and 4 views that would most likely mean that two people looked at the message twice.
Your unique clicks reflect the total number of subscribers who have clicked the link, whereas the regular clicks reflect the total number of times the link has been clicked.
For example, if you sent the message to 5 subscribers and each of them clicked on it twice, it would be 5 unique clicks and 10 regular clicks.
The all-time clicks statistics also tracks the number of times the link has been clicked in previous email blasts. This feature is especially useful when you use reoccurring links, as it gives you an overall figure.