ClickBank Marketplace is a collection of thousands of digital products. ClickBank does not own those products, ClickBank is simply an aggregator/payment processor. The products listed in the marketplace are created and owned by vendors - people that create and want to sell digital products.
Since ClickBank Marketplace has several thousands of ready to promote products, the products are organized into categories. Each product is listed in one main category and one secondary category. You can find the list of the main marketplace categories and all secondary categories on this page.
Click on a ClickBank Marketplace category that interests you to load the list of the products listed in that category. The displayed clickbank products will be by default sorted by their popularity rank with the most popular products being displayed at the top of the list. Use the provided drop down box to change the default sort order to be gravity, percent per sale, earned per sale, and etc.
To the left of the clickbank product description you will find the links named "Stats" and "Web Site" The "Stats" link will take you to the analytics page for the selected clickbank product whereas the "Web Site" link will take you to the product page.
You might also want to try searching for a particular product listed in the ClickBank Marketplace if you know what you are looking for. Search ClickBank Marketplace page allows you to specify the search words and apply various filters as you search the clickbank marketplace.