Adware:Adware (or spyware) is a small program that is designed to show advertisements (in various form and degrees of intrusiveness) on your computer. It often reports personal information back to its owners. As a result your sense of privacy can be violated.
Relevancy is a malware spyware that records user search queries and sends gathered data to a predefined web server. Relevancy can get into the computer along with some ad-supported software. It also can be manually installed.
Technical details (How to remove Relevancy(pop up))