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Here's an in-depth explanation of the URL query parameters you're interested in:
### Marketing and Campaign Tracking Parameters
These parameters are commonly used in marketing to track website traffic and campaign performance, often associated with Google Analytics:
* **`utm_source=gemini`**: This identifies the source of the traffic. In this case, "gemini" indicates that the traffic originated from Gemini (likely the Gemini application or website).
* **`utm_medium=web`**: This specifies the advertising or marketing medium that brought the user to the page. "Web" suggests it came from a general web presence, as opposed to email, social media, or paid ads.
* **`utm_campaign=advmktgsite`**: This defines the name of the specific marketing campaign. "advmktgsite" suggests it's related to an "advertising marketing site" campaign.
You can learn more about these UTM parameters from the [VTEX Help Center](
https://help.vtex.com/tutorial/what-are-utm-source-utm-campaign-and-utm-medium--2wTz7QJ8KUG6skGAoAQuii) and [Google Analytics Help](
URL builders: Collect campaign data with custom URLs - Analytics Help
Discover how to use Google Analytics’s URL builder to add utm parameters in order to identify the campaigns that refer traffic.By adding utm camp...
).
### Google Analytics and Tracking Parameters
These parameters are typically used by Google Analytics (especially Google Analytics 4) for user tracking, session management, and cross-domain measurement:
* **`_gl=1*ja01r4*_gcl_au*MTgyNjU5ODkxMi4xNzM4NzgxOTg3*_ga*NDM3OTI3MDQwLjE3Mzg3ODE5ODc.*_ga_WC57KJ50ZZ*MTczODc4MTk4Ny4xLjAuMTczODc4MTk4Ny4wLjAuMA..`**: This is a linker parameter primarily used for **cross-domain tracking** in Google Analytics 4. It helps pass session information and user identifiers between different domains (e.g., if a user navigates from `siteA.com` to `siteB.com`) to ensure they are tracked as a single user and session. It bundles together information from other Google Analytics cookies. You can find more details on this in the [Anowave Quick Tips](
Anowave
Understanding _gl and _ga_ URL parameters (_gl=1*1)
Regarding cross-domain tracking and _gl, _ga URL parameters
) and [Google Analytics Help Center](
[GA4] Set up cross-domain measurement - Analytics Help
This article is for website owners who need unified measurement across more than one domain, e.g. across a customer website and a separate shopping...
).
* **`_gcl_au*MTgyNjU5ODkxMi4xNzM4NzgxOTg3`**: This segment within the `_gl` parameter (or sometimes as a separate cookie) is set by **Google Ads** and plays a significant role in tracking and measuring the performance of advertising campaigns. It's used to store and track conversions, linking user interactions with ads to subsequent actions on a website. More information is available from [Captain Compliance](

Captain Compliance
_gcl_au Cookie: What is It & What Does it Do?
What is the _gcl_au Cookie? The _gcl_au cookie is a third-party cookie set by Google Ads. It plays a significant role in tracking and measuring the...
).
* **`_ga*NDM3OTI3MDQwLjE3Mzg3ODE5ODc.`**: This segment within the `_gl` parameter (or as the primary `_ga` cookie) is a core Google Analytics cookie used to **distinguish unique users**. It helps Google Analytics differentiate between different visitors to a website. This cookie has a lifespan of two years. You can learn more about it in Google's [Privacy & Terms](
https://policies.google.com/technologies/cookies?hl=en-US) and from [OptimizeSmart Newsletter](

Optimize Smart
Understanding Google Analytics 4 cookies - _ga cookie
Learn all about Google Analytics 4 cookies: _ga cookie. Google Analytics 4 (GA4) set cookies to identify unique users and sessions, to throttle th...
).
* **`_ga_WC57KJ50ZZ*MTczODc4MTk4Ny4xLjAuMTczODc4MTk4Ny4wLjAuMA..`**: This parameter, similar to `_ga`, is also a Google Analytics cookie used to **distinguish users**, specifically on websites that utilize Google Tag Manager or for specific Google Analytics 4 properties. The `WC57KJ50ZZ` part is likely a unique measurement ID for a specific Google Analytics 4 property.
### Language Parameter
* **`hl=en_GB`**: This parameter specifies the **host language** or the interface language for the page. `en_GB` indicates that the language should be English (United Kingdom). This affects the display language of the page, including messages and buttons. You can read more about the `hl` parameter in this [O'Reilly book excerpt](
https://www.oreilly.com/library/view/google-hacks-2nd/0596008570/ch01s12.html).
Oh really
https://gemini.google.com/app/164081b502c3f8cf?utm_source=gemini&utm_medium=web&utm_campaign=advmktgsite&_gl=1*ja01r4*_gcl_au*MTgyNjU5ODkxMi4xNzM4NzgxOTg3*_ga*NDM3OTI3MDQwLjE3Mzg3ODE5ODc.*_ga_WC57KJ50ZZ*MTczODc4MTk4Ny4xLjAuMTczODc4MTk4Ny4wLjAuMA..&hl=en_GB