Hemp be a sturdy mate, grown for its fibers and seeds. It's got low levels of the mind-bending compound called THC, so it won't get ye high like the treasure of a successful plunder. Hemp be used fer makin' ropes, sails, and even some edibles.
Marijuana, on the other hand, be the more rebellious one, with high levels of THC that can make yer mind dance a jig. It be sought after by landlubbers fer its potent effects, givin' 'em a swirly trip to Tortuga.
So remember, hemp be like a trusty shipmate, while marijuana be like a wild cannonball. Keep yer wits about ye and know the difference on the high seas of the cannabis world, arrr!