Bars are a popular snack option and a good source of energy and nutrients. They usually come in a handy, portable size, making them perfect as an on-the-go snack or quick meal replacement option. Bars come in many different flavors and varieties, from sweet to salty and from vegan to high protein. Some of the most popular types of bars include granola bars, protein bars, fruit bars and nut bars. Some bars also contain special ingredients like superfoods or probiotic cultures.