Here is what you need to be familiar with to understand the Items Frequently Bought Together report:
1.) Individual Product Count (FILTER): By default, this filter limits the results to only display orders that have between 2 and 5 individual products on them so you can see popular combinations
This keeps orders with only 1 item out of the report, as well as those with a lot of products (because then you start getting too many combinations with no patterns).
2.) Products Bought Together: The Product Titles of the products included on an order, arranged alphabetically (to avoid duplicates).
For example, looking at the first row we can see there were 94 Orders that had a 12-Pack Drink Floaties and a Unicorn Cruiser (no other items on the order).
3.) Individual Product Count: The number of unique product titles on that order.
This is different from Line Item Count, which would count say, a Pink Unicorn Cruiser and a Blue Unicorn Cruiser as 2 separate Line Items.
For example, there were only 2 individual products on those 94 orders in the first row.
4.) Orders: The number of Orders that had that combination of individual product titles.
For example, 83 Orders had the Sail on a Slice and Unicorn Cruiser.