An annual is a plant that lives for only one season. An annual will be planted, sprout, flower, seed, and then die all in the same year. These plants are usually bright and showy, they tend to bloom all season long, and are usually less expensive than perennials because they do have to be planted each year. However, because of their seeding you may end up with new plants sprouting the following year without having to plant anything new, but they usually aren’t where you want them.
Be sure to check the tags with each plant to determine whether they would act as an annual or perennial in your specific zone hardiness area.
A few annuals that would thrive in the desert (where I live) include: