GCLID, explained
When auto-tagging is switched on in Google Ads, every click on an ad adds a parameter called gclid to the landing-page URL, with a long unique value. That value identifies one click: the campaign, ad group, keyword and time behind it. Unlike UTM parameters, which you write yourself and which describe a campaign, a GCLID describes a single click and is generated by Google.
Meta does something similar. Links clicked from Facebook and Instagram usually carry an fbclid parameter, the Facebook click ID. Both are called click IDs. On their own they mean little to a person reading a report, but they are the key an ad platform needs to connect a click to what happened afterwards.
That is why a CRM should save the click ID with the lead. When an enquiry becomes a paying customer weeks later, the business can report that outcome back to the ad platform, which Google calls offline conversion import, so bidding learns which clicks produce buyers rather than just form fills. For a Pune real estate developer whose site visits happen offline, this is the only way the ad account learns which leads bought. Keep the values exactly as received, because a click ID that has been trimmed or retyped no longer matches. DigiPix Flow saves gclid and fbclid with website leads.