Satisfaction tab: CSAT from your conversations
Go to Apps → Caro → Analytics → Satisfaction. On the Starter/Trial plan, this shows a single locked section requiring an upgrade to CSAT Analytics.

What CSAT Analytics gives you
CSAT (Customer Satisfaction) reporting rolls up satisfaction signals across conversations into a trackable score over time — a higher-level view than reading individual Rate helpful / Rate not helpful feedback one conversation at a time.
Where satisfaction data comes from in the meantime
Even without this tab unlocked, you can still see satisfaction at the individual-conversation level via the thumbs-up/thumbs-down ratings in Conversations — this tab's value is aggregating that (and likely other signals) into one trend you don't have to piece together conversation by conversation.
See Plans and what they unlock for which plan includes CSAT Analytics.