Sensing (i.e. picking up information about its environment through sense organs) is a physical phenomenon and is reasonably well-understood. Consciousness is non=physical and takes that information (after processing in the brain) and directly experiences it. Consciousness is an extra step, and if it's fundamental then that is a kind of substance dualism.
So what's conscious? People and other animals with sense organs and nervous systems. It's even possible that anything which senses its environment could be conscious: https://organism.earth/library/document/what-is-it-like-to-b... . That might include a robot connected to a camera and other sensory apparatus. Now you could argue that a computer running an LLM can pick up what its user types, and might therefore be conscious of which keys are being pressed. But not of the colours, sounds, smells, and other things described by human authors in its training set.