Threads and async are orthogonal. Threads allow you to do work in parallel. Async allows you to increase CPU utilization in a single process/thread. writing as

Threads and async are orthogonal. Threads allow you to do work in parallel. Async allows you to increase CPU utilization in a single process/thread. writing async code to avoid threads Async can be used in single-process systems. It can make sense to use async techniques to maximize work being done on each process/thread. Working with threads and using async methods can both be complex if you don't have good abstractions for doing so. They can be used together to great effect if you have the right tools.