Here's why:
* Origins: Sign languages evolved organically as people needed ways to communicate despite hearing impairments or in situations where spoken language wasn't feasible (like in noisy environments or long distances).
* Diversity: There are hundreds of sign languages globally, each with unique features and structures, reflecting the specific cultures and languages they developed alongside.
* No Single Inventor: While individuals may have contributed to the evolution of sign languages in their communities, there's no single "inventor."
Important Note: Sign languages are complex and nuanced, just like spoken languages. They are not simply a set of gestures but have their own grammar, syntax, and vocabulary.
To learn more about specific sign languages, you can look up information on the sign language used in your region or any other language that interests you.