# Functions Concepts

Functions are blocks of code that run on demand without the need to manage any infrastructure. Develop on your local machine, test your code from the command line (using `doctl`), then deploy to a production namespace or App Platform — no servers required.

[Functions Glossary](/glossary/functions/): This glossary defines DigitalOcean-specific terms related to DigitalOcean Functions.

[Best Practices for Rearchitecting Monolithic Applications to Microservices](https://www.digitalocean.com/community/conceptual_articles/rearchitecting-monolithic-applications-to-microservices): This community tutorial reviews some best practices for rearchitecting monolithic applications to use microservices, including an overview of microservices, migration considerations, and an example using a Flask application.