The user entered your product page directly, without coming from a search page. This can happen if the user had bookmarked the URL, or refreshed the browser while on the product page.
The user was browsing Kitely Market, and saw your product.
Front Page - the user saw your product in the front page of Kitely Market (i.e., without entering any specific search terms or viewing a specific category).
Categories - the user had clicked on a specific category, and saw your product inside that category.
Keywords - the user had entered text in the search box.
The user was browsing Kitely Market inside your store.
The sub-channels under "Search Store" are the same as under "Search Market": they are "Front Page", "Categories" or "Keywords". But in all of these cases, the search was performed while the user was viewing your store; not the general market.
When the ad is displayed, this counts as one Product Impression.
When the ad is clicked, this counts as one Product View.
When the ad is displayed, this has no effect on product analytics. (This does count as one Ad impression, but the Analytics Channels show Product Impressions; not Ad Impressions.)
When the ad is clicked, the Store Page is shown. All of the product thumbnails shown as a result count as Product Impressions that belong to the Ads channel.
If any of these thumbnails is clicked then that counts as one Product View.
If the user performs any other navigation action, e.g. clicks on a category, then the link to the ad is "broken" and subsequent product views no longer count as belonging to the Ads channel (they belong to the "Search Store" channel instead).
Sometimes a single view of a product is counted in multiple channels. For example, suppose the user was viewing a category, and they also entered text in the search box. In that case, the products that are shown as the results of the search will be counted in two channels: in the "Categories" channel, and in the "Keywords" channel.
The "Direct" channel will always have "Impressions" = 0. That's because "Direct", by definition, means that the user entered the product page without coming from a search page.