Topic: API vs Protocol vs Query language
API :: A defined interface what data that lets
programs or systems interact and exchange data or
functions.
Protocol :: A set of rules governing how data is
transmitted and communicated between systems.
Query Language :: A formal set of commands or syntax
used to request or manipulate data from a system.
| System | Query Language | Protocol | Usage Domain |
|---|---|---|---|
| REST | No | Yes | Web APIs |
| gRPC | No | Yes | RPC, APIs |
| SQL | Yes | No | Databases |
| GraphQL | Yes | No* | API querying |
*GraphQL is a specification.
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