Eight cores in one microcontroller might sound intimidating. It might seem complicated to have to write programs for all of them. But the Propeller C language has pre-written code tasks, called functions, that make it easy.
Just think of functions as recipes the head chef can hand over to assistants, instead of having to explain to each one how to cook. One assistant can even ask another assistant for help, without bothering the head chef. Just as a team of 8 chefs can efficiently manage great meals, the Propeller with its eight cores can efficiently manage great inventions. Now that's teamwork!
A C library is a collection of functions, sort of the way a cookbook is a collection of recipes.
A C program can use functions from many different libraries, just as a meal might use recipes from several different cookbooks.