▪ Runtime: select the runtime as part of configuring the
function, and Lambda loads that runtime when initializing
the environment.
▪ Handler: function runs starting at the handler method.
▪ Function: is a resource that you can invoke to run your
code in Lambda.
▪ Trigger: is a resource or configuration that invokes a
Lambda function.
▪ Event: is a JSON-formatted document that contains data
for a Lambda function to process.
▪ Execution environment: provides a secure and isolated
runtime environment for your Lambda function.
https://docs.aws.amazon.com/lambda/latest/dg/gettingstarted-concepts.html