These are the general packaging types that designer’s need to design for the product packaging. There are more variants for each one; but this is for general understanding.
PRIMARY PACKAGING: This is where the consumer will use the product. For example, a syrup used as a medicine; and a bottle format will be used; or a blister for the capsules.
SECONDARY PACKAGING: This is where the bottle will be. But this is the optional packaging. Many times this packaging will not be used. For example, a ketchup bottle where the box is not required on the other hand, medical syrup will use box to hold.
THIRD PACKAGING: This packaging will be used for transportation. Normally, this will be a corrugated box.
ADDITIONAL PACKAGING: This is a packaging used for display which will be used by stores to display in a tray for tthe product for the consumers. Many times this will be a part of packaging where a store can directly place it for the display.