system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did the first language come about?

Edit: Thank you all for your inputs, and I was talking about spoken language.
gpt
Since we didn't have writing until much later, it's all speculation.
But warning cries, cries for help, then sounds for food eventually became more complex.  Our voice boxes improved about the same time our brains got bigger, so it's not sure whether complex sounds came before or after we had the intellect for language (it could have started with sign language).
Some interesting asides : dolphins are the only animals (besides humans) that seem to use names for each other.  Dogs obviously recognize their name that we give them, but in the wild they don't use names.
There have been some cases where (human) twins, as small children, invented their own language to talk to each other.