Well, a triad is like a group of bad guys who work together to do bad things. They are usually based in China or other parts of Asia.
Now, these bad guys follow a set of rules and traditions that they call the "code." This means they have to be loyal to each other, keep their secrets, and not talk to the police.
They also have different ranks within their group, just like in a game. The leader is called the "dragon head," and under him are the "red poles" and the "white poles," who do different jobs to help the group.
The triad members make their money by doing things that are illegal, like smuggling drugs, selling guns, or even kidnapping people for ransom. They have a lot of power and can be very dangerous, so it's important to stay away from them and tell the police if you ever see anything suspicious.