Cartwise is an adware application, which might be offered to users when they browse websites known to host adult or pirated content. The offer happens with the help of fake pop-ups or advertisements, which tell the visitors that they need to complete a verification process to proceed. The surprising part is that sometimes the verification also requires them to install Cartwise. However, you can rest assured that a legitimate service or website will never ask you to install a dubious 3rd-party add-on, and any offer of this sort should be taken with a grain of salt.
When the Cartwise extension is added to a Web browser such as Chrome, Firefox or Opera, it may display various ads regularly, which might promote a broad range of products and services. However, the majority of the Cartwise Ads appear to lead to Amazon product links whose URLs also include an affiliate ID. Basically, this means that the authors of Cartwise are using its ad-injecting capabilities to lure users to purchase products via their affiliate links, therefore netting them a hefty commission for each successful sale.
Cartwise is not harmful, but it can be rather annoying to deal with certainly. Cartwise may have an adverse impact on your Web browsing experience due to the large number of ads it will inject in all active browser tabs. Thankfully, you can make sure to never see the Cartwise ads again by running a reputable PC security tool that will dispose of this parasite.