the digital traces left behind by a user's web browsing activity, including their browsing history, cookies, cached files, downloaded files, bookmarks, and other data stored by a web browser on a computer, which can be used by investigators to track a user's online activity; essentially, it's a term used in digital forensics to describe the evidence left behind when someone uses a web browser.
Web browser activity artifacts are digital clues suspects create when they use web browsers on mobile devices. Browser history, cookies, cache, and file downloads are all web activity artifacts that investigators may find useful during a mobile device investigation