By allocating provisioned concurrency, additional resources are made available so requests can be processed with low latency. Lambda functions configured with provisioned concurrency are ideal for production. However, there is an additional cost involved.
In AWS Console -
In Terraform -
References
https://docs.aws.amazon.com/lambda/latest/dg/provisioned-concurrency.html
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lambda_provisioned_concurrency_config