What is common table salt made of?

Table salt is one of the most common household chemicals. It is 97% to 99% sodium chloride (NaCl). Pure sodium chloride is an ionic crystal solid. However, other compounds are present in table salt, depending on its source or additives that may be included before packaging. In its pure form, sodium chloride is white. Table salt may be white or may have a faint purple or blue tinge from impurities.

Source: ThoughtCo.com