Ads by MarkKit is a potentially unwanted program classified as adware. Its presence in your PC is a result of you installing some other free programs into your computer. As a result, all your browsers installed on the PC will be affected. When you open them to look for some information online, you will see many of these Ads by MarkKit popping up randomly. Surely, this is very annoying to experience such pop-ups. Following this guide will help you to get rid of this adware from your computer.