Leveraging offline conversions in Google Ads involves tracking actions that occur outside the digital realm, such as in-store purchases or phone inquiries, that result from online advertising efforts. This data is crucial for advertisers as it provides a more comprehensive view of campaign performance and ROI. By integrating offline conversion data, businesses can better understand the impact of their online ads on offline sales, allowing them to make more informed decisions regarding their advertising strategies. This approach helps fine-tune Google Ads campaigns for increased profitability by focusing on the most effective tactics and channels, ultimately improving overall campaign performance and return on ad spend.