We talk of Adware and Malware a lot, and the last invasion that has shown up is the use of rogue Profiles on your Mac or iPhone/iPad. Profiles are a legitimate way that IT departments can deploy certain system, network, and device configurations to your Mac or iPhone/iPad. The problem is that scammers can also deploy a rogue Profile that can do all types of bad things, from slowing down your computer, to stealing your information.
Unless you were given a Profile by your IT department at work or school, you probably don't need one. If one is showing up, it's often a bad thing.
To check for Profiles on your iPad or iPhone, go to Settings -> General. If you have a Profile installed you will see an option for Profiles & Device Management.
On your Mac, go to System Preferences. If you have or had a Profile installed at one point, you will see a Profile preference..
Remember that schools and businesses will deploy Profiles for device management, but if it is your personal device, then its presence is suspect.