What is the difference between concurrency and parallelism?

Question

What is the difference between concurrency and parallelism?

Examples are appreciated.

Answer 1

Concurrency vs Parallelism

Rob Pike in 'Concurrency Is Not Parallelism'

Concurrency is about dealing with lots of things at once.

Parallelism is about doing lots of things at once.

[Concurrency theory]

Concurrency - handles waiting operation Parallelism - handles thread stuff

My vision of concurrency and parallelism

[Sync vs Async]