Uncountable noun:
* When referring to salt as a substance, it is uncountable.
* Example: "Add some salt to the soup."
* In this case, you wouldn't say "one salt" or "two salts."
Countable noun:
* When referring to specific units of salt, it becomes countable.
* Example: "There are three salts on the table."
* Here, "salts" refers to individual containers or packets of salt.
To determine if "salt" is countable or uncountable, consider the context and the intended meaning.