AWS Lambda is a serverless compute service offered by Amazon Web Services (AWS). It allows users to run code without provisioning or managing servers, and only pay for the compute time consumed by their functions.

AWS Lambda supports multiple programming languages such as Node.js, Python, Java, C#, and Go. This allows users to write their functions in the language of their choice.

AWS Lambda can be triggered by a wide variety of events, such as changes to data in an Amazon S3 bucket, a new record in a DynamoDB table, or an incoming request to an API Gateway. This makes it a versatile service that can be used in a variety of scenarios.

Some common use cases for AWS Lambda include:

• Backend logic for mobile and web applications

• Automation of data processing tasks

• File processing and image compression

• Real-time stream processing

• Building and running microservices

• Running cron jobs

AWS Lambda can also be integrated with other AWS services, such as Amazon S3, Amazon DynamoDB, Amazon Kinesis, and AWS Step Functions, to build powerful, serverless architectures.

In summary, AWS Lambda is a cost-effective, scalable and serverless compute service that allows users to run their code without having to manage servers. It is triggered by a variety of events and can be used in a wide range of scenarios, from simple automation to building microservices and real-time stream processing.