Final answer:
AWS Lambda supports multi-threading and multi-processing within the resource limits of the function's execution environment. Concurrent execution is possible with Lambda's execution model, where each event may trigger a new instance of the function.
Step-by-step explanation:
Yes, you can use threads and processes in your AWS Lambda function code. AWS Lambda supports multi-threading and multi-process programming paradigms within the constraints of the execution environment. Each Lambda function runs in an isolated environment with its own resources. However, the ability to use multiple threads or processes may be limited by the memory and CPU allocated to the function. Lambda's execution model processes events in response to triggers, and for each event, a new instance of the function may be initiated. If your use case requires concurrent execution, you can enable multi-threading or multiprocessing in your function's code.