OBS now features WHIP support, with the patch having been recently merged. This enables various new functions and possibilities with OBS WHIP, as the latency drops from 1 second to 200 milliseconds.
Without OBS WHIP, you can employ RTMP+WebRTC for live streaming, which results in a latency of approximately 500ms. However, by using OBS WHIP, you can achieve low-latency live streaming with a latency of around 200ms.