> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Calldata

> Read-only input data supplied to an EVM contract call, commonly containing function selectors and encoded parameters.

# Calldata

Read-only input data supplied to an EVM contract call, commonly containing function selectors and encoded parameters.

## Definition

Read-only input data supplied to an EVM contract call, commonly containing function selectors and encoded parameters.

## Why it matters

Smart-contract concepts are essential for understanding programmable blockchain applications.

## Related knowledge

* [ABI](/generated/v2/glossary/abi) — term
* [Smart Contract](/generated/v2/glossary/smart-contract) — term
* [Solidity](/generated/v2/resources/solidity) — term

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**Canonical knowledge ID:** `glossary:calldata`