Structured concurrency

Structured concurrency is a way of writing programs so that it's easier to control how many things can happen at once. Think of it like having a group of people who are all trying to do different jobs at the same time. In structured concurrency, instead of trying to figure out how to divide up all the jobs between them yourself, you can write a program that tells each person exactly which job they should do, and how many of them can do a job at the same time. That way, you can make sure that only the right number of people are doing each job and all the jobs are done in the right order.