---
title: definition
framework: network
role: symbol
role_heading: Type Property
path: network/nwprotocoltcp/definition
---

# definition

The system definition of the Transport Control Protocol.

## Declaration

```swift
static let definition: NWProtocolDefinition
```

## See Also

### Creating TCP Connections

- [NWProtocolTCP.Options](network/nwprotocoltcp/options.md)