Event loops are a paradigm for processing events different than your typical single-threaded or multi-threaded application. Your request gets broken down into async "events" that are executed in a loop to improve performance and minimize synchronization across threads. It is famously used by Node.js as the backbone of their event processing and also by several other technologies like Redis and Nginx.
In this article I'll explain the reason for why this paradigm was created and what it tries to optimize. By the end you'll come out a little wiser, and know more than just "don't block the event loop" :).
Motiviation - why event loops?
To understand why we need event loops we will explore a simple but key example. Take this straightforward HTTP request code, which sends a request and then tries to read the response from the socket:
def send_http_request_GET(domain: str, request: str) -> HttpResponse:
