The source – searchengineland.com
Google Ads has introduced improved conversions for potential leads. During the beta-testing in early February, this variant offers an alternative to the existing method of offline conversions based on Google Click ID. Using this data can increase the efficiency of campaigns.
This will allow more advertisers to implement their offline conversions.

When a potential client enters the lead form on your site, you will most likely receive his/her data, including email address, name, home address and/or phone number. This data can be listed in the conversion tags, hashtagged and sent to Google.