If you are getting notifications from DigitalSearchApp, then your Mac is infected with adware. DigitalSearchApp is adware for Mac.
DigitalSearchApp changes setting in your Mac. First, DigitalSearchApp installs a browser extension in your browser. Then, after DigitalSearchApp 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.