Clicks are the number of clicks you get on your Sniply link. This refers to the number of people who click on your link to view the content.
Conversions refer to the number of people who click on your call-to-action, such as a button.
There are also Verified Conversions, which tracks specific actions taken on your page. For this, you'll need to set up a conversion pixel on something like a post-purchase thank-you page. Here's how you can set up a conversion pixel https://sniplyhelp.zendesk.com/hc/en-us/articles/5880077792020-How-do-I-setup-a-Conversion-Pixel-