text: **WebSocket APIs**
  
  WebSocket APIs are a connection of WebSocket routes that are integrated with backend HTTP 
  
  endpoints, Lambda functions, or other AWS services. A client can send messages to a service, and 
  
  services can independently send messages to clients, making these APIs bidirectional. Because 
  
  of this, WebSocket APIs are often used as chat applications or for multiplayer games or ﬁnancial 
  
  trading platforms. 
  
  **Related resource(s):**
  
  • About WebSocket APIs in API Gateway - Get started with WebSocket APIs 
  
  • Tutorial: Building a serverless chat app with a WebSocket API, Lambda, and DynamoDB - 
  
  Intermediate level WebSocket API tutorial using AWS CloudFormation 