Caching is a data-management heuristic that allows developers to reuse previously created information, such as files or data, instead of creating it again from scratch. In the context of mobile CI/CD systems, caching relates to moving data between isolated builds, eliminating the need for extra steps like bootstrapping the environment and downloading dependencies, which can take precious execution time. By storing required content locally, caching reduces the need to access remote servers or the internet, making build times faster and optimizing workflows. This concept is similar to a cooking analogy, where ingredients are stored in a refrigerator to save time, and similarly, data is cached to retrieve it faster from memory rather than disk. Caching can be applied to software dependencies, saving time by eliminating the need to download them off the internet when running builds on local systems.