Cross-device visitor identification refers to the issue and process of recognizing website visitors when they access a site from different devices - desktop, tablet, mobile, etc.
Cross-device visitor identification has many purposes.
It prevents to count too many unique visitors as recognizing a visitor across browsers and devices allows to count him as a single visitor.
It allows to track and study behaviors and conversion paths from multiple devices on a website.
Most often, cross-device visitor identification is done by using login usernames.
Main web analytics solutions offer tools and solutions for cross-device visitor identification but all cross-device visitors can’t be identified.