Anyone who enlists in the military must take this test. The overall percentile score, known as the "AFQT Score," determines whether or not one can even enlist (see Minimum ASVAB Score Requirements).
In addition to the overall AFQT Score, individual composite scores determine enlisted job qualifications.
For complete details about the ASVAB, see the feature article, ABCs of the ASVAB.
For tips and techniques to improve your ASVAB scores, see our Top Ten ASVAB Study Guides listing.