# What is concurrency? What is parallelism?

Getting Started

##### Post Metadata
- Posted at: over 9 years ago
- Net upvotes: 1


## Comments
### Comment 1

Concurrency refers to utilizing multiple containers to run multiple builds at the same time. Otherwise, if you don't have enough free containers available, your builds queue up until other builds finish.

Parallelism splits a given build’s tests across multiple containers, allowing you to dramatically speed up your test suite. This enables your developers to finish even the most test-intensive builds in a fraction of the time.

##### Comment Metadata
- Posted at: over 9 years ago
- Author title: Vice President of Marketing at Testlio




## Related Product
[CircleCI](https://www.g2.com/products/circleci/reviews)

## Related Category
[Continuous Integration](https://www.g2.com/categories/continuous-integration)

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