Google Ads

Linking your Google Ads account to your Analytics property lets you see the full customer cycle, from how users interact with your marketing (e.g., seeing ad impressions, clicking ads) to how they finally complete the goals you’ve set for them on your site (e.g., making purchases, consuming content).

If you have active campaigns on Google Ads it is recommended link accounts to better reports. if you do not link your accounts yet, do it.