Concurrency (computer science)

ability of different parts or units of a program, algorithm, or problem to be executed out-of-order or in partial order, without affecting the final outcome

In concurrent computing, multiple calculations are made within overlapping time frames. It takes advantage of the concept that multiple threads or processes can make progress on a task asynchronously. This general approach to writing and executing computer programs is called concurrency.

Concurrency is different from parallel computing, as parallel computing uses multiple processors, each of which are assigned a single, synchronous thread.