If enabled, your article content will be scanned for links to any products in your store. If any are found and the sidebar is enabled, those products will be display in the sidebar and tooltips will show up on hover of the product links.
Note that these tooltips and sidebar elements will work if the blog post contains links to any of your store's products. The links must contain the full url, including the domain name of the website, otherwise, they will not be picked up. Links to products in external websites will be ignored as well.