Aquarius, the Water Bearer, (January 20 - February 18) is the final air sign of the Western zodiac, and it is ruled by Uranus, the planet of change, upheaval, technology, and innovation. It might be confusing that Aquarius is an air sign rather than a water sign, but think of it this way: in esoteric spaces, water is the element that represents consciousness. Aquarius isn't a being of the water/consciousness itself (unlike those intuitive Cancer, Scorpio, and Pisces folks), but rather the entity of air and intellect bringing that awareness to the world.
If you're still a bit confused, don't worry. Aquarians are used to people thinking they're a little far-out! In fact, they pride themselves on being non-conformists. An Aquarius will likely be very politically aware and have strong opinions regarding matters of the environment and social justice. They are clever, witty, friendly, and loyal to their friends and loved ones, but they will occasionally get so swept up in their customary Big Picture thinking that they may sometimes become distant or appear to be aloof.
Gifts for an Aquarius should appeal to their sense of individuality or affinity for gadgets!