Adware is any software package which automatically pops up , or downloads advertisements to a computer after the software is installed on it or on other system tools (eg.IE browser). It's usually secretly installed without user's informed consent, and conduct unwanted behaviors like collect information, download and install potentially unknown applications, change system settings, and occupy CPU resources. Once installed, removement is a hard operation.

 

Adware is frequently downloaded as part of a free software, shared software, or UltraRscEditor, and be installed along with those softwares into computer system without user's authorization.