2020-11-03 12:53:17 -08:00
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---
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title: "Overview"
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---
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2020-11-13 10:18:04 -08:00
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An [app](terminology.md#app) interacts with a Solana cluster by sending it
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[transactions](transactions.md) with one or more
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[instructions](transactions.md#instructions). The Solana [runtime](runtime.md)
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passes those instructions to [programs](terminology.md#program) deployed by app developers
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beforehand. An instruction might, for example, tell a program to transfer
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[lamports](terminology.md#lamports) from one [account](accounts.md) to another
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or create an interactive contract that governs how lamports are transferred.
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2020-11-03 12:53:17 -08:00
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Instructions are executed sequentially and atomically for each transaction. If
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any instruction is invalid, all account changes in the transaction are
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discarded.
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To start developing immediately you can build, deploy, and run one of the
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[examples](developing/deployed-programs/examples.md).
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