system
Given the following post, respond as if you're commenting on Reddit:
human
When two different countries meet for the first time (for example, when Europeans first landed in America.) how do they end up understanding and translating one another's language?
gpt
If peoples engage in regular trade, they end up developing a *pidgin*: each side's traders ends up knowing some words from the other side, and they arrive at a basic system of communication for their transactions. If the contact persists and deepens, if people start intermarrying or otherwise living with the other side, they might pass the pidgin to their children as a mother tongue; because all mother tongues need to have a full-fledged grammar (while pidgins don't), these children will adapt the two languages' grammar into a new one, with vocabulary from the pidgin, forming a *creole* language.