Well annuals are ones that only live one time each year. mj lives from spring to fall then, in nature, dies and hopefully spreads some seeds and they sit there chillin till next spring then germ and grow annually
Yes, it is an annual- this means that it dies back and must be replanted from year to year (though if pollinated, it may go to seed and reseed itself as is common amongst annuals). It will not come up year after year and must be replanted.