Glossary term
What is Concurrency / Parallelism? Meaning for developers
Juggling many tasks / doing many tasks at the same instant. Example: One cook switching dishes vs several cooks at once.
Learn it properly · System DesignLesson 4: Processes, Threads & Concurrency for Backend EngineersMost backend work is waiting. How one server juggles thousands of requests — processes, threads, event loops and lightweight threads — and the race conditions, deadlocks and pool limits that appear the moment it does.