Chinese salt typically refers to monosodium glutamate (MSG), a flavor enhancer commonly used in Chinese cuisine and other Asian dishes. MSG is the sodium salt of glutamic acid, an amino acid that naturally occurs in many foods. In addition to its culinary use, MSG enhances umami flavor, which is one of the five basic tastes.
It's worth noting that "Chinese salt" may sometimes be used informally to refer to other seasoning blends used in Chinese cooking. However, if you are specifically asking about MSG, it is the primary substance associated with that term in culinary contexts.