If you are getting notifications from InetImprovment, then your Mac is infected with adware. InetImprovment is adware for Mac.
InetImprovment changes setting in your Mac. First, InetImprovment installs a browser extension in your browser. Then, after InetImprovment hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.