The _gat cookie is primarily used in Google Analytics. Its main function is to limit the frequency of data collection to prevent overloading Google's servers on high-traffic sites.
For example, if a website receives tens of thousands of visitors daily, each page visit by a user sends data to Google Analytics, which could result in massive data volumes. By using the _gat cookie, Google Analytics can set limits to ensure that only a certain number of requests are sent within a short period, effectively managing data flow and server load.
This limitation is typically implemented by setting a delay, such as configuring the cookie to expire after one minute, thereby limiting the number of data requests sent per minute. This ensures the efficiency of data collection and the stability of the server, while also optimizing the user's website experience.