The technical answer is that Hyperledger Composer is an abstraction layer over Hyperledger Fabric.
The practical answer: it's awesome. Think about how Angular and hundreds of other frameworks make web programming simple.
This is a framework in which you can write a blockchain in Javascript and specify your data objects in an easy-to-understand text file. Drop some queries, ACL files, and paths to use some useful opening tools that let you do things like create a web API automatically and play in a web environment without setting any elements.
We use it to block the Integra Ledger Legal. (Www.integraledger.com). I just spent the day working in it.
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