"Clair" is the French word for *clear*. The clair senses are the perceptual channels through which intuitive information arrives — clear seeing, clear hearing, clear knowing, clear feeling. Distinct from empath types (which are about which kind of signal you are sensitive to: emotional, physical, intuitive, etc) and from chakras (which are about energy centers in the body), the clairs are about how the message gets in.
Most people are strong in one or two of these channels and dimly aware of the others. Read each card below; the one (or two) where you find yourself thinking "wait — that's just how my brain works, I thought everyone did that" is almost certainly your primary clair.