Cargo is among the most important aspects of the games. You purchase cargo in crates at the various ports, for variable amount of money per crate; this amount changes with every voyage (1 week). The goal is to buy your cargo at a low price, and to sell it at a higher price, as this would the main way you will earn your money.
Often, certain high priced goods become contraband in different ports. If you enter a port with contraband goods, you will be stopped by a Customs agent. At first, they will seize the cargo almost 100% of the time, but there are various items you can buy that lower this chance, such as the Faker's Crate. Should you successfully enter with contraband, it can then be sold at a ridiculously high price. This is a tactic called Smuggling.