Tag-based analytic
These arrived in the mid-1990s and those of us old enough will remember seeing bright-green visit counters on the bottom of many pages. You can still find them dotted around the corners of the internet. Most of these had disappeared by 2000, or so it seemed. Instead of the graphic disappear completely it had been replaced by a small invisible pixel, which wl sent to the analytic software was able to log information about the activity on the page and behavior of the user. This method continues to evolve the pixel itself has been replaced by code(although some people still refer to this code as the pixel), but it is now the more commonly used form of analytic as it is able to overcome some of the challenges that server-based analytic has faced. It does not, however, offer some of the solutions server-based analytic can.