DataLoader is a generic utility used as part of application's data fetching layer. It provides a consistent application programming interface (API) over different remote data sources such as web services or datasets by batching and caching.
Data Loader API was originally developed by Nicholas Schrock at Facebook in 2010. It is used to consolidate the miscellaneous key-value store back-end APIs at the time. DataLoader became one of the implementation specifics of the Ent framework, a privacy-aware data entity loading and caching layer within web server product code.
DataLoader ultimately became the base for Facebook's GraphQL server implementation and type definitions.
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