# Welcome
<a name="Welcome"></a>

## Amazon Lex Model Building V2
<a name="Welcome_Amazon_Lex_Model_Building_V2"></a>

This document provides detailed information about the Amazon Lex V2 API actions and their parameters.

For information about the IAM access control permissions you need to use this API, see [Identity-based policies for Amazon Lex V2](https://docs.aws.amazon.com/lexv2/latest/dg/security_iam_service-with-iam.html).

Amazon Lex V2 Model Building V2 operations let you build and manage bots.

If you use a custom HTTP client to call Amazon Lex Model Building V2 operations, you must set the "Content-Type" HTTP header to "application/x-amz-json-1.1". Otherwise, you receive an HTTP 404 - UnknownOperationException in the response.

Amazon Lex Model Building V2 operations return the responses with the "application/x-amz-json-1.1" content type.

You can use [AWS SDKs](http://aws.amazon.com/tools/#sdk) to access Amazon Lex V2 APIs using your favorite programming language. The SDKs automatically perform useful tasks for you, such as:
+ Cryptographically sign your service requests
+ Retry requests
+ Handle error responses

The following resources provide additional information about the Amazon Lex V2 Model Building API.
+  *Amazon Web Services General Reference* 
  +  [Amazon Lex V2 Endpoints for each region](https://docs.aws.amazon.com/general/latest/gr/lex.html).
+  * AWS Command Line Interface * 
  +  [ Amazon Lex Model Building V2 CLI commands](https://docs.aws.amazon.com/cli/latest/reference/lexv2-models/index.html).

## Amazon Lex Runtime V2
<a name="Welcome_Amazon_Lex_Runtime_V2"></a>

The following resources provide additional information about the Amazon Lex Runtime V2 API, which you use to send user input to a bot and process conversations at runtime:
+  *Amazon Web Services General Reference* 
  +  [Amazon Lex V2 Endpoints for each region](https://docs.aws.amazon.com/general/latest/gr/lex.html).
+  * AWS Command Line Interface * 
  +  [ Amazon Lex Runtime V2 CLI commands](https://docs.aws.amazon.com/cli/latest/reference/lexv2-runtime/index.html).