2018-09-06 20:51:36 -04:00
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# ABCI
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ABCI is the interface between Tendermint (a state-machine replication engine)
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2018-09-30 12:35:52 -04:00
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and your application (the actual state machine). It consists of a set of
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2018-09-06 20:51:36 -04:00
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*methods*, where each method has a corresponding `Request` and `Response`
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message type. Tendermint calls the ABCI methods on the ABCI application by sending the `Request*`
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messages and receiving the `Response*` messages in return.
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All message types are defined in a [protobuf file](https://github.com/tendermint/tendermint/blob/develop/abci/types/types.proto).
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This allows Tendermint to run applications written in any programming language.
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This specification is split as follows:
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- [Methods and Types](abci.md) - complete details on all ABCI methods and
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message types
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- [Applications](apps.md) - how to manage ABCI application state and other
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details about building ABCI applications
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- [Client and Server](client-server.md) - for those looking to implement their
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own ABCI application servers
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