Why is visiting a .onion site generally more anonymous than visiting a normal website through the Tor Browser?
A normal site is reached via an exit node (which can see non-HTTPS traffic), whereas .onion traffic never leaves the Tor network, so there's no exit node and the connection stays end-to-end encrypted inside Tor.
Normal websites via Tor Browser (e.g. google.com): your connection runs through several Tor relays, so the site sees only the exit node's IP — anonymity is high but not perfect. Risks: the exit node can read unencrypted (non-HTTPS) traffic, and browser fingerprinting / behavioural patterns over time can still de-anonymise you.
Onion websites (.onion domains): built specifically for Tor and reachable only through it. Because the traffic stays entirely inside the Tor network and never hits an exit node, it's harder to trace, there are no exit-node risks, encryption is end-to-end within Tor, and you get bidirectional anonymity (both you and the operator stay anonymous).
Practical recommendation: for maximum safety use only HTTPS sites, disable JavaScript for unknown sites, clear cookies regularly, and set the Tor Browser security level to "Safest."
Tip: No exit node = no bad-exit problem. That single fact is why .onion is the more private way to reach a service.