Browser

A browser is the client program that requests, renders and runs a page; in analytics it is a dimension whose name and version are parsed out of the User-Agent string.

The browser dimension is not a measurement but the output of parsing: a parser library turns the string the browser declares about itself into a name and a version, and every tool ships its own rules. That is why browser share for one site never matches exactly across two tools, especially for Chromium-based browsers such as Edge, Opera and Samsung Internet, which all carry a Chrome token in their string. In-app browsers are the sharper trap: a visitor opening a link inside Telegram or Instagram is filed under Chrome or Safari in many reports, even though that runtime imposes its own limits and behaves differently. The usual wrong conclusion is that the largest browser is the most important environment; the right ranking multiplies each environment's share by the gap between its error or conversion rate and everyone else's.