Fluent Python: Clear, Concise, and Effective Programming

by Luciano Ramalho

Concurrency is about dealing with lots of things at once. Parallelism is about doing lots of things at once. Not the same, but related. One is about structure, one is about execution. Concurrency provides a way to structure a solution to solve a problem that may (but not necessarily) be parallelizable.1 Rob Pike, Co-inventor of the Go language