Two major advantages of C++20 std::jthread over legacy std::thread:

1. Auto-Joining on Destruction: If a std::thread destructor runs while joinable, it calls std::terminate() and crashes your program. std::jthread automatically calls .join() in its destructor!
2. Built-in Cancellation Tokens (std::stop_token):

std::jthread worker([](std::stop_token stoken) {
    while (!stoken.stop_requested()) {
        // Perform background work
    }
});
// worker.request_stop() and worker.join() executed automatically when worker goes out of scope!

std::jthread brings RAII safety to thread management. No more accidental crashes from forgetting .join() before throwing exceptions.

The std::stop_token mechanism is clean and integrates nicely with conditional variables via std::condition_variable_any.